QComboBox does not allow continuation of scrolling outside of viewport

With a combobox opened and using a QScroller if a user drags on the viewport to scroll it, but then continues to scroll outside of the viewport (without lifting up a finger) the viewport no longer responds to the move event. I only saw this with a combobox in the middle of the screen. Oddly enough, if you moved your finger to the top left part of the screen (0,0) the viewport will once again continue scrolling and responding to move events.

QTBUG-115576 for some more context.