Krita! https://docs.krita.org/en/reference_manual/tools/ellipse.htm...

> Use this tool to paint an ellipse. The currently selected brush is used for drawing the ellipse outline. Click and hold the left mouse button to indicate one corner of the ‘bounding rectangle’ of the ellipse, then move your mouse to the opposite corner. Krita will show a preview of the ellipse using a thin line. Release the button to draw the ellipse.

I can :o) But I completely agree, it's very non-obvious. It beggars belief that they haven't fixed that issue. Another poster suggested Krita - that's a good suggestion IMO (even thou I still like Gimp too)