MapQuickItem drawn at wrong location after vertical resize

It seems MapQuickItems can be drawn at the wrong location after a window is vertically resized. (It seems to work OK if window is resized horizontally, or in both directions).

This can be seem with the Map Viewer (QML) example in Creator on Windows with Qt 5.15.2.

Run the example, and you see the location of the Qt Company is:

If you resize the window by dragging the window at the bottom middle (not bottom right corner), the Qt Company location moves:

If you then resize horizontally or zoom in, the MapQuickItem is redrawn in the correct position.

I've also seen an example in a bigger app where the MapQuickItems are at the wrong location when the widget is first shown - but this seems the easiest way to demonstrate the problem.