Game freezes when entering room with newly-spawned slugpup (Survivor)

[native thorn]

After waking up from hibernation, whenever a slugpup spawns in a room and I enter it, the game immediately hard freezes with a really stretched out looking screen. I can't do anything except alt + f4 the game.

Additionally (not sure if this is related problem or no), whenever I try to spawn the slugpup in the current room with Dev Console, it returns an "index out of range" error message and my slugcat (along with any creature present) start clipping into room geometry and eventually the game freezes again. I can spawn slugpups in arena mode just fine.

Error message is:

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index