QColorDialog : Buttons are highlighted incorrectly

Both cancel and ok buttons are highlighted at the same time when
the user takes following series of actions.

1. Run the attached sample project qtbug104805.zip
2. Press "PushButton" that opens ColorDialog
3. Click Ok to close the dialog
4. Press "PushButton" and click "Cancel" to close the dialog
5. Press "PushButton" again to open the ColorDialog

Both Open and Cancel buttons are highlighted.

This does not happen with Qt6.2.4.