Your fix of QTBUG-64128 doesn't work as expected:

Now QQuickArea::dragEnterEvent() checks if the drag source is an ancester of "this".

This works only as expected if Drag.source of the dragged item is not set.

In my case Drag.source isn't set to the parent of the dragged item but to an ancester of it which holds all the necessary data for a complex drop operation. Since this item unfortuantely is also an ancester of my DropArea it doesn't work.

You see: Your fix of QTBUG-64128 doesn't work in all cases and it leads to a weird behavior of DropArea which furthermore is not documented.