After every kill from a Scarecrow i get this message in the server log.
<color=#aff>[grenade.beancan.entity[250881]] SwitchParent Missed frankensteinpet_corpse[256717]</color>
<color=#aff>[hatchet.entity[250879]] SwitchParent Missed frankensteinpet_corpse[256717]</color>

Same here

Same.

I edited the NightZombies.cs file and simply deleted line 530 
corpse.TakeChildren(_scarecrow); 
completely and that solved the problem for me.

but that causes..

0x89A

Currently working on a fix, bear in mind this will prevent parented entities from being transferred to the corpse for example if you shoot an arrow into a zombie, when it dies that arrow won't be transferred to the corpse and will stay on the actual zombie.

but that doesn't bother me and I can live with that, better than the console spam.