diff --git a/.changeset/user-filters-button-type-os6952.md b/.changeset/user-filters-button-type-os6952.md
new file mode 100644
index 0000000000..3503987de4
--- /dev/null
+++ b/.changeset/user-filters-button-type-os6952.md
@@ -0,0 +1,32 @@
+---
+"@object-ui/plugin-list": patch
+---
+
+`UserFilters` preset tab buttons no longer submit an enclosing form; all six buttons declare `type="button"`
+
+An HTML `<button>` defaults to `type="submit"` inside a `<form>`, so a preset
+filter tab (`filter-tab-*`, tabs mode) submitted the enclosing form on every
+click. The three buttons objectstack#6952 named now declare `type="button"`
+explicitly — the dropdown chip trigger (`filter-badge-*`), the overflow trigger
+(`user-filters-more`) and the preset tab — joining the session-tab buttons that
+objectstack#5236 already declared it on.
+
+Only one of the three was actually at risk, and the difference is measured
+rather than assumed. The chip and the overflow trigger are
+`PopoverTrigger asChild` children, and Radix's `PopoverTrigger` renders
+`Primitive.button type="button"`; its Slot merges that onto a child declaring no
+`type` of its own, so both already rendered as `button`. Reverting the change
+confirms it: those two keep reading `button`, the plain preset tab button reads
+`null`. For the two triggers this therefore moves a contract out of an upstream
+implementation detail and into local source — the same reasoning objectui#3344
+wrote onto the Combobox trigger — while the preset tab is a real fix.
+
+Dormant rather than live: the only mount point today is `ListView`'s toolbar,
+which is not inside a form, so no shipped screen submitted anything. The new
+tests pin every rendered `UserFilters` button, in both modes, so a future button
+cannot land at the submit default and an upstream Radix change surfaces in this
+package's tests instead of in a user's form.
+
+The in-file comment claiming "a Radix trigger keeps the HTML default of `submit`"
+is corrected in passing — it is the inaccuracy that propagated into
+objectstack#6952's premise.
diff --git a/packages/plugin-list/src/UserFilters.tsx b/packages/plugin-list/src/UserFilters.tsx
index bf49a995bb..bad5704ffa 100644
--- a/packages/plugin-list/src/UserFilters.tsx
+++ b/packages/plugin-list/src/UserFilters.tsx
@@ -509,6 +509,13 @@ function DropdownFilters({ fields, objectDef, data, onFilterChange, maxVisible,
       <Popover key={f.field}>
         <PopoverTrigger asChild>
           <button
+            // Inside a <form> a bare <button> defaults to type="submit", so an
+            // untyped trigger would submit the enclosing form on every click
+            // (objectui#3344). Radix's PopoverTrigger happens to supply
+            // type="button" via its Slot today, but that is an upstream
+            // implementation detail — declare the contract locally, exactly as
+            // the Combobox trigger does.
+            type="button"
             data-testid={`filter-badge-${f.field}`}
             className={cn(
               'inline-flex items-center gap-1 h-7 px-2 text-xs transition-colors shrink-0 rounded-md',
@@ -670,6 +677,10 @@ function DropdownFilters({ fields, objectDef, data, onFilterChange, maxVisible,
             <Popover>
               <PopoverTrigger asChild>
                 <button
+                  // Same as the chip trigger above: Radix supplies type="button"
+                  // via its Slot today, but the contract is declared locally
+                  // (objectui#3344).
+                  type="button"
                   data-testid="user-filters-more"
                   className="inline-flex items-center gap-1 h-7 px-2 text-xs text-muted-foreground hover:text-foreground transition-colors shrink-0 rounded-md"
                 >
@@ -854,6 +865,12 @@ function TabFilters({ tabs, showAllRecords, allowAddTab, onFilterChange, classNa
         return (
           <button
             key={tabId}
+            // A plain button, NOT a Radix trigger — nothing supplied a type, so
+            // this one really did render as type="submit" and clicking a preset
+            // tab inside a <form> submitted it (objectui#3344 family;
+            // objectstack#6952 measured it: the two triggers above already read
+            // `button`, this one read `null`).
+            type="button"
             data-testid={`filter-tab-${tabId}`}
             onClick={() => handleTabChange(tabId)}
             className={cn(
@@ -911,8 +928,10 @@ function TabFilters({ tabs, showAllRecords, allowAddTab, onFilterChange, classNa
         >
           <PopoverTrigger asChild>
             <button
-              // Explicit type: a Radix trigger keeps the HTML default of
-              // `submit`, which submits an enclosing form on click (#3344).
+              // Same as the chip trigger: Radix supplies type="button" via its
+              // Slot today, but the contract is declared locally (objectui#3344).
+              // (Corrected from "a Radix trigger keeps the HTML default of
+              // submit" — objectstack#6952 measured that it does not.)
               type="button"
               className="inline-flex items-center justify-center h-7 w-7 rounded-md text-muted-foreground hover:text-foreground hover:bg-muted shrink-0"
               data-testid="filter-tab-add"
diff --git a/packages/plugin-list/src/__tests__/UserFilters.test.tsx b/packages/plugin-list/src/__tests__/UserFilters.test.tsx
index c1d8a70bc0..ee37cda326 100644
--- a/packages/plugin-list/src/__tests__/UserFilters.test.tsx
+++ b/packages/plugin-list/src/__tests__/UserFilters.test.tsx
@@ -269,3 +269,136 @@ describe('UserFilters — i18n resolver overrides an explicit author label (regr
     expect(screen.getByTestId('filter-badge-project_type').textContent).toContain('项目类型');
   });
 });
+
+describe('UserFilters — every button declares type="button" (objectstack#6952, objectui#3344 family)', () => {
+  // An HTML <button> defaults to `type="submit"` INSIDE a <form>, so an untyped
+  // filter control submits the enclosing form on every click — objectui#3344's
+  // shape, applied to the three UserFilters buttons that predated it.
+  //
+  // The three were NOT equally at risk, and the difference is measured, not
+  // assumed. Reverting the fix leaves the chip (`filter-badge-*`) and the
+  // overflow (`user-filters-more`) triggers reading `type="button"` anyway:
+  // both are `PopoverTrigger asChild` children, and Radix's PopoverTrigger
+  // renders `Primitive.button type="button"`, which its Slot merges onto a
+  // child that declares no `type` of its own. Only the preset tab button is a
+  // plain button — reverting makes it read `null`, i.e. submit. So the fix is
+  // one real (dormant) defect plus two contracts moved from an upstream
+  // implementation detail into local source, exactly the reasoning #3344 wrote
+  // down on the Combobox trigger.
+  //
+  // Dormant, not live: the only mount point today (ListView's toolbar) is not
+  // inside a form. These assertions keep it that way when composition changes,
+  // and they pin the Radix behaviour so an upstream change surfaces here rather
+  // than in a user's form.
+  const noopSubmit = (e: React.FormEvent) => e.preventDefault();
+
+  const tabsConfig = {
+    element: 'tabs' as const,
+    tabs: [
+      { name: 'all', label: 'All', isDefault: true },
+      { name: 'urgent', label: 'Urgent', filter: [{ field: 'priority', operator: 'equals', value: 'urgent' }] },
+    ],
+  };
+
+  // Radix-supplied today; the assertion pins the rendered contract either way.
+  it('dropdown chip trigger declares type="button" and does not submit an enclosing form', () => {
+    const onSubmit = vi.fn(noopSubmit);
+    render(
+      <form onSubmit={onSubmit}>
+        <UserFilters
+          config={{ element: 'dropdown', fields: [{ field: 'status' }] }}
+          objectDef={objectDef}
+          data={[]}
+          onFilterChange={() => {}}
+        />
+      </form>,
+    );
+
+    const chip = screen.getByTestId('filter-badge-status');
+    expect(chip.getAttribute('type')).toBe('button');
+    fireEvent.click(chip);
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  it('the chip clear affordance does not submit the enclosing form either', () => {
+    // The × lives INSIDE the chip button and only stopPropagation()s, which
+    // does not cancel a submit button's activation behaviour — so the chip's
+    // own `type` is what keeps a clear click from submitting.
+    const onSubmit = vi.fn(noopSubmit);
+    render(
+      <form onSubmit={onSubmit}>
+        <UserFilters
+          config={{ element: 'dropdown', fields: [{ field: 'status' }] }}
+          objectDef={objectDef}
+          data={[]}
+          onFilterChange={() => {}}
+          initialSelections={{ status: ['todo'] }}
+        />
+      </form>,
+    );
+
+    fireEvent.click(screen.getByTestId('filter-clear-status'));
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  // Radix-supplied today, like the chip.
+  it('the "More" overflow trigger declares type="button" and does not submit an enclosing form', () => {
+    const onSubmit = vi.fn(noopSubmit);
+    render(
+      <form onSubmit={onSubmit}>
+        <UserFilters
+          config={{ element: 'dropdown', fields: [{ field: 'status' }, { field: 'points' }] }}
+          objectDef={objectDef}
+          data={[]}
+          onFilterChange={() => {}}
+          maxVisible={1}
+        />
+      </form>,
+    );
+
+    const more = screen.getByTestId('user-filters-more');
+    expect(more.getAttribute('type')).toBe('button');
+    fireEvent.click(more);
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  // The one that genuinely rendered as submit before this change.
+  it('preset tab buttons declare type="button" and do not submit an enclosing form', () => {
+    const onSubmit = vi.fn(noopSubmit);
+    render(
+      <form onSubmit={onSubmit}>
+        <UserFilters config={tabsConfig} objectDef={objectDef} data={[]} onFilterChange={() => {}} />
+      </form>,
+    );
+
+    const preset = screen.getByTestId('filter-tab-urgent');
+    expect(preset.getAttribute('type')).toBe('button');
+    expect(screen.getByTestId('filter-tab-all').getAttribute('type')).toBe('button');
+    fireEvent.click(preset);
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  it('no rendered UserFilters button is left at the submit default (sweep, both modes)', () => {
+    // A sweep rather than three named checks: a future button added to this
+    // file is caught here without anyone remembering to extend the list.
+    const { container: dropdownContainer } = render(
+      <UserFilters
+        config={{ element: 'dropdown', fields: [{ field: 'status' }, { field: 'points' }] }}
+        objectDef={objectDef}
+        data={[]}
+        onFilterChange={() => {}}
+        maxVisible={1}
+      />,
+    );
+    const dropdownButtons = Array.from(dropdownContainer.querySelectorAll('button'));
+    expect(dropdownButtons.length).toBeGreaterThan(0);
+    expect(dropdownButtons.map(b => b.getAttribute('type'))).toEqual(dropdownButtons.map(() => 'button'));
+
+    const { container: tabsContainer } = render(
+      <UserFilters config={tabsConfig} objectDef={objectDef} data={[]} onFilterChange={() => {}} />,
+    );
+    const tabButtons = Array.from(tabsContainer.querySelectorAll('button'));
+    expect(tabButtons.length).toBeGreaterThan(0);
+    expect(tabButtons.map(b => b.getAttribute('type'))).toEqual(tabButtons.map(() => 'button'));
+  });
+});