I noticed in your screenshot that you have too many overlapping stationary lights. That’s why there is a red “X” on the light and that is also why the light isn’t behaving as desired. You can check this guide for more info:
The purpose for deleting assets from the level is to narrow down the issue so that you are able to reproduce the problem with the smallest amount of stuff possible. That way you can figure out what is actually causing the problem, and if the problem goes away while removing content that may lead you to what the problem asset actually is. It isn’t meant as a solution but as a means to gather information.
If you are unable to reproduce this issue in a blank project with only the assets needed for the bug then we cannot continue this investigation.