Modpack version
0.5.4

Issue
No rats or pipers are spawning, with even adjusted configs in server files. Spawning rats work. Vanilla mobs are also spawning on top of garbage piles which is not supposed to happen

Thank you for the report, I will investigate the issue.

Ah yes, I should just need to update, will get it done asap:
AlexModGuy/Rats#210