Hi Klaus! I noticed the strange behavior of webgl hotspots.
We have an overlay that according to the viewing area.
It has a green button that responds to the mouse events.
But when the webgl hotspot is located under the button, it reacts to mouseover and mouseout.
And it interferes with navigation.
I created this test to demonstrate the problem: https://karta3d.net/aua/bugs/layout-onover/
Hover over the hotspot in the center of the screen.
css3d hotspots work correctly.