This issue is, in a way, a continuation of [this issue|https://bugs.mojang.com/projects/MCPE/issues/MCPE-35767?filter=allopenissues.] 

There's really not much to this, I enabled the Mario Mashup Pack and then the world wouldn't load at all. Even after removing it, the world stays unusable. This world worked just fine yesterday and suddenly tonight it's busted.

Every time I try to load the world it just says: "There was a problem loading this world."

What I've tried:
Adding a different pack/removing that pack
Restarting game/Switch
Clearing cache 

Is there anything I missed or should have done about this? I don't think there's much that I can do about this, other than just hope for a fix from Mojang.