When you enter and exit custom biomes with different sky colors, it's more prevalent that when entering and exiting these boundaries, that the sky flickers. Here's a video exemplifying this oddity:

The video isn't loading.

The video isn't loading.

Likely not compatible with your device. Only seems to load on desktop. I'll get another post sorted, below: https://streamable.com/qnrhgz

Yeah, I loaded it on a computer and it worked. I see the issue, should be a pretty easy fix for when I get home.

Does this 1.20.4 build fix it?
mod.zip

Tested the above .jar - less flickery, but there is still a change in sky colors, but not as bad as it was in 2.0.0.

Edit: Happened during storms, but I think it was fine otherwise, needs more testing.

Happened during storms, but I think it was fine otherwise, needs more testing.

fixed, try this

released

Tested, still bugging, not as bad as before, just suddenly switches from what you can see below when moving, possibly still a biomes issue? I sadly cannot make a video, but if getting logs is an option, you can run me through that.

May I have your world file?

Above screenshots are from a multiplayer server.

just suddenly switches from what you can see below when moving, possibly still a biomes issue

I think you're just on the biome border where both biomes have different sky colors, which means it works as intended.
Try w/o BO and see if the results are the same.