Unity 2021.2.0b11 WebGL lighting and shadow inconsistencies

I ran into this as well (in WebGL builds only). In my case it turned out to be an issue with loading normal map textures through Addressables. It took forever to figure out what was going on, including lots of dumb workarounds I tried related to normals and tangents, but eventually I stumbled on a tip which solved it. I’m not sure it’s the same issue you’re having but it’s probably worth trying anyway - changing the importer settings to Default instead of Normal:

The only pain related to the above that I’ve noticed is that you get warnings pop up telling you this or that texture is not set to be a normal map, and you have to click ignore or whatever - and it asks the same question about the same textures on occasion and you can’t disable the warnings.

Edit: I retested in latest, appears to be fixed (2022.2.0b2, URP 14.0.3, Addressables 1.20.3).