According to your testing, does the issue occur with ONLY Immersive Portals mod and Fabric API?

Yes

Describe the issue

So my friend is having a problem with ImmersivePortals were when he joins a world it get stuck on save and crashes. Is there nay way to fix this?

Which mc version? Which mod version? Are the two people using the same mods?

He tried with 1.18.2 and 1.16.5 fabric and forge. And the lates version that can be installed at the moment, and yes.

Try using MC 1.19.4 Fabric. If it still crashes with the latest version of Immersive Portals, post the crash report.

Ok

Thanks it worked now hes not having problems!