After server reboot, server never start
[12:36:14] [Server thread/WARN] [minecraft/Chunk]: Wrong location! (71, -29) should be (70, -27), EntityRat['entity.rats.rat'/79, l='ServerLevel[world]', x=1149.45, y=64.09, z=-450.50]
[12:36:14] [Server thread/WARN] [minecraft/ServerWorld]: Trying to add entity with duplicated UUID 56628ca8-77a1-4260-8922-484da7c67711. Existing rats:rat#79, new: rats:rat#80
[12:36:14] [Server thread/WARN] [minecraft/ServerWorld]: Trying to add entity with duplicated UUID 56628ca8-77a1-4260-8922-484da7c67711. Existing rats:rat#79, new: rats:rat#85

Unfortunately, I don't support 1.12 anymore, but I would make sure you're on the latest version of rats. I think this was something that was fixed in a newer version.