I narrowed it down to this Mod, and it was working fine just a few days ago. I updated some other mods before launching the game today, so I guess another mod makes it crash with this one. The problem is I don't know which mod since I hit "update all" and didn't check which ones got updated.

I can share all the mods I have installed if this might help in any way.

It's this mod combined with Sodium 0.6 that causes the crash

Try this, Change the leaves culling setting from whatever you had to "fast". This fixed the issue for me. There may be other leaves culling settings you can use that can fix the issue probably but I'm too lazy to try them all.

How I knew to change that setting specifically was that I saw it was throwing errors relating to leaves culling.

Should be fixed in 0.27.1