Is lit mode preview in material editor broken in 5.1?

Hi,
I’ve got this problem since 5.1. Material in preview is always black when in editor. On scene it’s all fine but when editing it’s always black. Only when unlit I can see textures. Is there a solution for this? It’s a bit annoying.
Adding images so you can see what I mean. In freshly set project.


Just in case if anyone has same issue. What helped was switching off background. Semisolution but at least you see your material texture.