I have tried multiple things to kill the zombies, but nothing seems to work.  We are running TruePVE mod, among several others, and even making sure ScarecrowNPC is listed in the npc section, we still cannot kill them.  Any ideas?  Could there be another mod causing this issue?  We've also seen this with another entity (scientists as some of the monuments also cannot be killed for some reason).

Remove the weird pooling system for the zombies, should avoid weird bugs like these now.