If you use Immersive portal mod, and have worlds stacked on top of each other, when passing through worlds, the entire mod get sort of "frozen", you cannot use a paraglider anymore, the stamina gauge is frozen, most of the mod simply stop.

You need to reload your world to fix it.

Using 1.20.1 Forge version of the mod, along with the Fabric version of Immersive Portal (with Sinytra Connector)