Qt Creator right-click menus appear on wrong display (macOS)

To repro on Qt Creator 4.15.0,

• on macOS without any external monitors attached (e.g. using a macBook Pro), start Qt Creator
• connect an external display
• move Qt Creator onto the external display
• open a Qt project and right-click on anything that is right-clickable

The menu appears incorrectly on the macBook display and not on the external display with Qt Creator!!

Note: This behaviour also occurs with P4V (perforce.com) which is also based on QT, so I think it's a bug with the QT core.

In addition, keep working for up to an hour and Qt Creator crashes. (This crashing with external monitors appeared in a Qt Creator build sometimes in the last 12 months.)

If I connect the external monitor first and then start Qt Creator or P4V, the right-click menus appear correctly with the application no matter which monitor it's displayed on.

I'm on macOS 10.15.7.

Thanks,