It seems the one where the npcs wouldn't harvest is resolved. they have harvested the bodies both few times they didnt die a painful death rex. Another thing, when taming with cooked mutton it would show good taming effectiveness, but when the taming was complete it acted as though it got no effectiveness thus getting no level. I should also mention these moments happened on a modded map called Amissa or something along those lines. I was worried they wouldnt spawn but they indeed do spawn there.

-Orizonta