This has bugged me none stop for the entire game, but the straw that broke the camels back just occurred right here. I am on my second playthrough in the Mountain pass, and I got ambushed by 2 death shepherds, a ghast, and 6 ghouls. As you can imagine, I am running a party that mostly uses slashing/ martial team. I reloaded and made a merc caster to burn them down. Here is the tldr: the shephard's revived each other EIGHT TIMES, and the 60 health ghoul 10 times EACH. I brought the caster, and tried to burn down their hp [resistances make this rough], but you got to save your slots for counter spell to prevent them from raising them. Even doing this, they kept revving, and revving, and reviving, and reviving.
THIS SAME BUG was in EA with the mephits. WE TOLD YOU TO FIX IT, AND YOU DID BUT ITS BACK ON FULL RELEASE WITH VENGENCE. This fight is harder then a CR 28 encounters i make in my pathfinder campaign, where I gave a boss 6 counts of legendary resistance on a Ancient Remorhaz meant for a full level 20 party of 6. I suppose giving a boss an ability use counter was to much to program right? just like all of the missing content, this does not get past Q/A. I am severely disappointed.