According to your testing, does the issue occur with ONLY Immersive Portals mod and Fabric API?
No
Describe the issue
Extended clouds crash the game when creating a world but it saves the world first I had a mod pack with it. If you want Immersive Portals with a mod pack you're using and it keeps on crashing make sure Extended Clouds is not in the mod pack.
According to your testing, does the issue occur with ONLY Immersive Portals mod and Fabric API?
No
Describe the issue
Extended clouds crash the game when creating a world but it saves the world first I had a mod pack with it. If you want Immersive Portals with a mod pack you're using and it keeps on crashing make sure Extended Clouds is not in the mod pack.