Edit: Pressed enter by accident without adding any text here. Oops.

When I try to rejoin a world with the Rats/Ratlantis mod and BoP installed, it fails to load the save. Both occur in 1.16.3. I believe this is the culprit.

all issues regarding ratlantis are being closed as the dimension has been completely rewritten from the ground up and shouldnt have these issues anymore in 1.19 and beyond