When I resize the EL window while its loading, I get these artifacts. No, my GPU is fine. It only happens during this small timespan. The artifacts vanish a second later when the loading has finished. It was really hard to snap a screenshot of this. I'd rate the severity of this as minor. Its a tiny bit annoying but only happens during starting if it happens at all. Resizing the window later works as expected with no artifacts.
Thing number two is something I do not have a screenshot of yet because it is really hard to capture, too.
At night when there is a thunderstorm ingame, the lightning effect is black. The world is overlaid by shadows instead of light. That looks unintended. I'd rate the severity as a bit more than low since it is more common and annoying than the thing above, yet still not affecting gameplay that much.
