I'm trying to set up Betweenlands in a skyblock pack, but it spawns the player in a new portal out in the void somewhere upon return, is there anything I can do to make this work?

Apparently my issue is that I use a schematic to generate the portal and it's not auto-linked. Closing this. For future readers: you have to find some way to make sure the initial portal is linked. If the player creates the portal himself, this is already set up.