diff --git a/stl/inc/system_error b/stl/inc/system_error
index 18ee8527ced..096447c7c10 100644
--- a/stl/inc/system_error
+++ b/stl/inc/system_error
@@ -654,7 +654,7 @@ _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
     [[_Clang::__require_constant_initialization__]] static _Ty _Static;
     return _Static;
 }
-#elif !defined(_M_CEE) // TRANSITION, VSO-1153256
+#elif !defined(_M_CEE)
 template <class _Ty>
 struct _Constexpr_immortalize_impl {
     union {
@@ -676,7 +676,7 @@ _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
     static _Constexpr_immortalize_impl<_Ty> _Static;
     return _Static._Storage;
 }
-#else // ^^^ no workaround / workaround vvv
+#else // ^^^ !defined(_M_CEE) / defined(_M_CEE), TRANSITION, VSO-1153256  vvv
 template <class _Ty>
 _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
     // return reference to a memcpy'd default-initialized _Ty
@@ -695,7 +695,7 @@ _NODISCARD const _Ty& _Immortalize_memcpy_image() noexcept {
     _Storage[0].store(_Target_iter[0], memory_order_release);
     return reinterpret_cast<_Ty&>(_Storage);
 }
-#endif // choose immortalize strategy
+#endif // ^^^ defined(_M_CEE), TRANSITION, VSO-1153256 ^^^
 
 _EXPORT_STD _NODISCARD inline const error_category& generic_category() noexcept {
     return _Immortalize_memcpy_image<_Generic_error_category>();
diff --git a/stl/src/excptptr.cpp b/stl/src/excptptr.cpp
index 929bfff7eb5..5cfc8406419 100644
--- a/stl/src/excptptr.cpp
+++ b/stl/src/excptptr.cpp
@@ -43,7 +43,7 @@ namespace {
         /* MAGIC */ static _Immortalizer_impl<_Ty> _Static;
         return reinterpret_cast<_Ty&>(_Static._Storage);
     }
-#elif !defined(_M_CEE) // _M_CEE test is TRANSITION, VSO-1153256
+#elif !defined(_M_CEE)
     template <class _Ty>
     struct _Constexpr_excptptr_immortalize_impl {
         union {
@@ -67,7 +67,7 @@ namespace {
     [[nodiscard]] _Ty& _Immortalize() noexcept {
         return _Immortalize_impl<_Ty>._Storage;
     }
-#else // choose immortalize strategy
+#else // ^^^ !defined(_M_CEE) / defined(_M_CEE), TRANSITION, VSO-1153256 vvv
     template <class _Ty>
     int __stdcall _Immortalize_impl(void*, void* _Storage_ptr, void**) noexcept {
         // adapt True Placement New to _Execute_once
@@ -86,7 +86,7 @@ namespace {
 
         return reinterpret_cast<_Ty&>(_Storage);
     }
-#endif // _M_CEE_PURE
+#endif // ^^^ !defined(_M_CEE_PURE) && defined(_M_CEE), TRANSITION, VSO-1153256 ^^^
 
     void _PopulateCppExceptionRecord(
         _EXCEPTION_RECORD& _Record, const void* const _PExcept, ThrowInfo* _PThrow) noexcept {