Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740

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Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from
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Jul 8, 2026
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Backport of #9739 to rel/4.3

/cc Amaury Levé (@Evangelink)

@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink) enabled auto-merge (squash) July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit that referenced this pull request Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink) mentioned this pull request Jul 8, 2026
Merged
@Evangelink
Amaury Levé (Evangelink) merged commit 79f26ff into microsoft:rel/4.3Jul 8, 2026
8 of 11 checks passed
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@nohwnd-bot@Evangelink

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
Merged
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@nohwnd-bot
@nohwnd-botnohwnd-bot
commented
Jul 8, 2026

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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@EvangelinkAmaury Levé (Evangelink)Evangelink approved these changes

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@nohwnd-bot@Evangelink

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
Merged
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@nohwnd-bot
@nohwnd-botnohwnd-bot
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Jul 8, 2026

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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@nohwnd-bot@Evangelink

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@EvangelinkAmaury Levé (Evangelink)Evangelink approved these changes

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@nohwnd-bot@Evangelink

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@EvangelinkAmaury Levé (Evangelink)Evangelink approved these changes

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@nohwnd-bot@Evangelink

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
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Amaury Levé (Evangelink) merged 1 commit into
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nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
Fix forward-compat crash loading old 2.x extensions on .NET Framework (#9710) by @Evangelink in #9739 (backport to rel/4.3) - #9740
Merged
Amaury Levé (Evangelink) merged 1 commit into
microsoft:rel/4.3from 
nohwnd-bot:backport/9739/to/rel/4.3
Jul 8, 2026
Merged
Conversation
@nohwnd-bot
@nohwnd-botnohwnd-bot
commented
Jul 8, 2026

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Backport of #9739 to rel/4.3
/cc Amaury Levé (@Evangelink)
@Evangelink
Fix forward-compat crash loading old 2.x extensions on .NET Framework (…
db89580
…microsoft#9710)
A newer Microsoft.Testing.Platform combined with an older (2.x) extension whose
netstandard2.0 asset was compiled against the platform's internal Polyfills.Polyfill
helper (shared via InternalsVisibleTo) threw MissingMethodException in
AppInsightsProvider.IngestLoopAsync on .NET Framework, crashing the process.
- Restore the exact Polyfills.Polyfill members old 2.x extensions reference
(Deconstruct, Contains x2, AppendJoin x2, CopyToAsync, SaveAsync), guarded to the
non-.NET-Core TFMs so they land only in the netstandard2.0 platform asset that is
loaded on .NET Framework. The type is already internal with IVT to the extensions;
[Embedded] only hides it from new compile-time references, so the CLR still resolves
old baked MemberRefs at runtime.
- Add TelemetryForwardCompatibilityTests reproducing the crash: current platform +
oldest supported 2.x telemetry extension (2.0.0) on net462 with telemetry enabled.
Verified red without the shim (exit code -532462766) and green with it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@Evangelink
Amaury Levé (Evangelink)
enabled auto-merge (squash)
July 8, 2026 15:00
Amaury Levé (Evangelink) added a commit
that referenced
this pull request
Jul 8, 2026
@Evangelink
Add MTP 2.3.1 section for forward-compat crash fix (#9739/#9710)
eeb9abe
New 2.3.1 UNRELEASED servicing section for the .NET Framework MissingMethodException regression (#9710) fixed by #9739, being backported to rel/4.3 via #9740.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
@EvangelinkAmaury Levé (Evangelink)
mentioned this pull request
Jul 8, 2026
 Merged

@Evangelink
Amaury Levé (Evangelink)
merged commit 79f26ff
into
microsoft:rel/4.3Jul 8, 2026

8 of 11 checks passed

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@EvangelinkAmaury Levé (Evangelink)Evangelink approved these changes

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2 participants

@nohwnd-bot@Evangelink