This is Immersive Portals Mod for Forge. The Fabric version
See through portals and go through portals seamlessly without loading screen.
-Dimension Stack Currently a bit broken...
See the Wiki for more information.
The 1.14 and 1.15 version of this mod depends on MixinBootstrap
It's not recommended to use the version for MC 1.16.x because it's outdated and incompatible with Forge's dynamic dimension feature.
Discord Server: https://discord.gg/BZxgURK