ChunkGenLimiter is a mod that shares Universal Tweaks' chunk generation limiting functionality, with the same configuration options. However, using both doesn't give a warning like using some other redundant mods (i.e. Surge) does.

this happens whether or not i have chunk gen limit toggle set to true fwiw

i'm too tired to test it rn but adding a class check for io.github.barteks2x.chunkgenlimiter.coremod.ChunkGenLimitTransformer might work?
this is an educated guess based off the premise that the class it's trying to detect isn't loaded

This should be fixed by 76cadee which will be in the next UT update. You can test with the latest Github Actions build artifact here.