Linux drag-and-drop events wrong for editable QComboBox

On Linux, an editable QComboBox does not receive drag-and-drop events correctly.  As soon as the drag enters the widget, it immediately gets both dragEnterEvent and dragLeaveEvent, and dropping on the widget does not call dropEvent, but instead (if the drop is a file) immediately enters file:///path-to-file in the line-edit part of the combobox.

A short PyQt6 example demonstrating the problem is attached.