Huge spike in monster spawns?

Yeah I ran into about 50 amoebic molds in my current run, not sure what to do about it. They aren’t dangerous, but I’m afraid if I wander upon a bunch of mi-gos or something more dangerous, I’d be toast.

After the rollback PR is merged, will it fix current worlds, or will we have to travel a bit to generate new terrain and have it take effect?