Will it still crash for you when just ending the turn outright (SHIFT + ENTER, or click on the AC)? And is it a specific unit with a specific tile to move to for the crash?
For the werewolves: I tested Baron, he does create new Ravenous. Tested Blooded, they also create new Ravenous and promote to Greater just fine. Tested Ravenous, not promoting and I do not THINK they are creating new ones, but since some died I can't be quite certain without testing again.
So the fields are working, just not in this particular case. So far I don't see WHY they aren't working either.
I would have suspected it was part of Enraged with how I made it more rigid about requiring that the unit do attack options, but even once calmed, the ravenous fail to upgrade. And besides that, by the time the upgrade is attempted, Enraged has already been removed from the unit.
Overall... PITA. Going to take some decent amount of time to trace down I am afraid, but hopefully it shows me some larger bug in the process, because everything LOOKS like it should work.