diff --git a/packages/react/src/otp-field/root/OTPFieldRoot.test.tsx b/packages/react/src/otp-field/root/OTPFieldRoot.test.tsx
index 4a83f528292..a2b9a14f38d 100644
--- a/packages/react/src/otp-field/root/OTPFieldRoot.test.tsx
+++ b/packages/react/src/otp-field/root/OTPFieldRoot.test.tsx
@@ -900,62 +900,60 @@ describe('<OTPFieldPreview />', () => {
       expect(onValueComplete.mock.calls[0]?.[1].reason).toBe(REASONS.inputChange);
     });
 
-    it('ignores hidden-input autofill when the field is readonly', async () => {
+    it.each([
+      { lockState: 'readOnly', label: 'inside Field', withField: true },
+      { lockState: 'disabled', label: 'inside Field', withField: true },
+      { lockState: 'readOnly', label: 'outside Field', withField: false },
+      { lockState: 'disabled', label: 'outside Field', withField: false },
+    ] as const)('ignores hidden-input autofill when $lockState $label', async ({
+      lockState,
+      withField,
+    }) => {
       const onValueChange = vi.fn();
       const onValueInvalid = vi.fn();
       const onValueComplete = vi.fn();
-
-      await render(
+      const otpField = (
         <OTPField
-          readOnly
-          name="otp"
+          readOnly={lockState === 'readOnly'}
+          disabled={lockState === 'disabled'}
+          name={withField ? undefined : 'otp'}
           onValueChange={onValueChange}
           onValueInvalid={onValueInvalid}
           onValueComplete={onValueComplete}
-        />,
+        />
       );
 
-      const hiddenInput = document.querySelector<HTMLInputElement>('input[name="otp"]');
-
-      expect(hiddenInput).not.toBeNull();
-
-      fireEvent.change(hiddenInput!, { target: { value: '12a34b56' } });
-
-      const inputs = screen.getAllByRole<HTMLInputElement>('textbox');
-
-      expect(inputs.map((input) => input.value)).toEqual(['', '', '', '', '', '']);
-      expect(onValueChange).not.toHaveBeenCalled();
-      expect(onValueInvalid).not.toHaveBeenCalled();
-      expect(onValueComplete).not.toHaveBeenCalled();
-    });
-
-    it('ignores hidden-input autofill when the field is disabled', async () => {
-      const onValueChange = vi.fn();
-      const onValueInvalid = vi.fn();
-      const onValueComplete = vi.fn();
-
       await render(
-        <OTPField
-          disabled
-          name="otp"
-          onValueChange={onValueChange}
-          onValueInvalid={onValueInvalid}
-          onValueComplete={onValueComplete}
-        />,
+        withField ? (
+          <Form errors={{ otp: 'test' }}>
+            <Field.Root name="otp">
+              {otpField}
+              <Field.Error data-testid="error" />
+            </Field.Root>
+          </Form>
+        ) : (
+          otpField
+        ),
       );
 
       const hiddenInput = document.querySelector<HTMLInputElement>('input[name="otp"]');
 
       expect(hiddenInput).not.toBeNull();
 
-      fireEvent.change(hiddenInput!, { target: { value: '12a34b56' } });
+      if (withField) {
+        expect(screen.getByTestId('error')).toHaveTextContent('test');
+      }
 
-      const inputs = screen.getAllByRole<HTMLInputElement>('textbox');
+      fireEvent.change(hiddenInput!, { target: { value: '12a34b56' } });
 
-      expect(inputs.map((input) => input.value)).toEqual(['', '', '', '', '', '']);
+      expect(getValues()).toBe('');
       expect(onValueChange).not.toHaveBeenCalled();
       expect(onValueInvalid).not.toHaveBeenCalled();
       expect(onValueComplete).not.toHaveBeenCalled();
+
+      if (withField) {
+        expect(screen.getByTestId('error')).toHaveTextContent('test');
+      }
     });
 
     describe('prop: autoSubmit', () => {
diff --git a/packages/react/src/otp-field/root/OTPFieldRoot.tsx b/packages/react/src/otp-field/root/OTPFieldRoot.tsx
index 713433d67c1..113e8440fd1 100644
--- a/packages/react/src/otp-field/root/OTPFieldRoot.tsx
+++ b/packages/react/src/otp-field/root/OTPFieldRoot.tsx
@@ -19,7 +19,7 @@ import { useAriaLabelledBy } from '../../internals/labelable-provider/useAriaLab
 import { useLabelableId } from '../../internals/labelable-provider/useLabelableId';
 import { useRenderElement } from '../../internals/useRenderElement';
 import { useValueChanged } from '../../internals/useValueChanged';
-import type { BaseUIComponentProps } from '../../internals/types';
+import type { BaseUIComponentProps, BaseUIEvent } from '../../internals/types';
 import {
   createChangeEventDetails,
   createGenericEventDetails,
@@ -406,8 +406,10 @@ export const OTPFieldRoot = React.forwardRef(function OTPFieldRoot(
               onFocus() {
                 focusInput(0);
               },
-              onChange(event) {
+              onChange(event: BaseUIEvent<React.ChangeEvent<HTMLInputElement>>) {
                 if (event.nativeEvent.defaultPrevented || disabled || readOnly) {
+                  // Outside Field.Root, the event is not wrapped by mergeProps.
+                  event.preventBaseUIHandler?.();
                   return;
                 }