diff --git a/packages/mui-joy/src/Autocomplete/Autocomplete.test.tsx b/packages/mui-joy/src/Autocomplete/Autocomplete.test.tsx
index 4f473204247567..e08ed63fe1ee08 100644
--- a/packages/mui-joy/src/Autocomplete/Autocomplete.test.tsx
+++ b/packages/mui-joy/src/Autocomplete/Autocomplete.test.tsx
@@ -1409,6 +1409,10 @@ describe('Joy <Autocomplete />', () => {
       // three option is added and autocomplete re-renders, restore the highlight
       setProps({ options: [{ label: 'one' }, { label: 'two' }, { label: 'three' }] });
       checkHighlightIs(listbox, 'two');
+
+      fireEvent.keyDown(textbox, { key: 'ArrowDown' }); // goes to 'three'
+
+      checkHighlightIs(listbox, 'three');
     });
 
     it("should reset the highlight when previously highlighted option doesn't exists in new options", () => {
diff --git a/packages/mui-material/src/Autocomplete/Autocomplete.test.js b/packages/mui-material/src/Autocomplete/Autocomplete.test.js
index 4a7a90935dbd4e..57bf88e2dea692 100644
--- a/packages/mui-material/src/Autocomplete/Autocomplete.test.js
+++ b/packages/mui-material/src/Autocomplete/Autocomplete.test.js
@@ -1839,6 +1839,10 @@ describe('<Autocomplete />', () => {
       // three option is added and autocomplete re-renders, restore the highlight
       setProps({ options: [{ label: 'one' }, { label: 'two' }, { label: 'three' }] });
       checkHighlightIs(listbox, 'two');
+
+      fireEvent.keyDown(textbox, { key: 'ArrowDown' }); // goes to 'three'
+
+      checkHighlightIs(listbox, 'three');
     });
 
     it('should reset the highlight when the input changed', () => {