Content of QToolButton dropdown menu is not narrated correctly

When you have a QToolButton that has a drop-down menu and you open the menu and use the keyboard to go through the menu, the Windows narrator stays silent most of the time.

On Windows use Ctrl+Win+Enter to enable the built-in screen reader. Then navigate to a QToolButton with a menu and press spcae to open it. Then use the arrow keys to go through the menu.

In my tests narration of the menu actually worked once. It wasn't perfect, I think it didn't properly announce that this is a button with a menu, instead it mentions the app windows title. Also when opening the menu it only says "space", it doesn't announce that a menu opened. I guess it should do that.

However, after that I didn't get it to work again. Once you open the menu and navigate inside it, the screen reader neither says anything, nor does it highlight the menu items.

Since it did it correctly once (but I don't know how to reproduce it), I guess the right code already exists, but usually isn't triggered.