Hi,
I think the problem could be that within your prefab fsm, you have referenced the hole or something NOT in the prefab, and that reference is lost when you instanciate a prefab in the scene.
else it might simply a silly miss in one of the actions.
Could you share the scene? if not, I can fo a working scene over the week end that fire a prefab bullet and where it falls creates a hole. but that will not be until monday.
Bye,
Jean