[REG 5.0.2 -> 6.0.0] Cannot zoom help mode using mouse wheel

1. Go to Help mode.
2. Move the mouse pointer to the shown help page.
3. While pressing the "Ctrl" key, turn the mouse wheel.
   Nothing happens. In Creator 5.0.2, this zooms the help page in and out, instead.
4. While pressing "Ctrl", press the "+" key.
   Creator will zoom into the help page. In the middle of the page, a small popup will show the new zoom factor.
5. While pressing the "Ctrl" key, turn the mouse wheel.
   Nothing happens.
6. Move the mouse pointer to that small popup.
7. While pressing the "Ctrl" key, turn the mouse wheel.
   Now you can zoom the help page in and out.

If I build the same revision of Creator's sources on Qt 5.15.2 instead of Qt 6.2.0, zooming works as expected. With Qt Assistant from Qt 6.2.0, I cannot reproduce the problem.