Long press on touch screen breaks drag and drop

When a drag session is started after a long press on a touch screen, the drop on finger release often does not work correctly, and you have to tap or click again to commit the drop.

You can reproduce this by running the attached sample code, which is taken from QTBUG-77414.

1. Launch the sample app.
2. Press and hold on one of the squares until Windows gives you the visual feedback that a long press as started, and then drag it over another square.

I've also attached a video that demos the issue using the sample app.

I think this could be related to the changes made in QTBUG-77414.

I've also tried this using Qt 5.15.13 and it seems to work as expected.

Qt Support: We tested this example and were able to reproduce the issue once.