https://gist.githubusercontent.com/natanfudge/1cbb32c70f3ee8d43ec7acef2f0bac29/raw/354595ddf5f55735fcb847f77c1e8435173457a8/crash.txt

Try allocating more ram to Minecraft whilst I try and find a solution here...

Solution: Look in the error log at about lines 5-10, it says (on one of the lines):

The sodium version that you use is incompatible with Immersive Portals.
Check https://github.com/qouteall/sodium-fabric/releases