I got to a fight in a manor in Heritage Hill, where at the end of the fight something strange happened...
First, Itumaak didn't revive (0 endurance, but 447/420 HP, which is strange).
Second, I couldn't save ("can't save in combat"), where on the other hand all the per-encounter spells were replenished and I couldn't cast any combat-only spell.
I wish I could upload the save file from just before the fight, but you got a pretty hard restriction on the file sizes. I mean, I couldn't even upload this 300K screenshot.
This screenshot shows the two conflicting "Combat only" and "Cannot save while in combat" messages.
Another thing, the output file contained A LOT of null-ref exceptions (I removed them). This exact exception also appeared almost endlessly in "cities: skylines" output file, which is strange.
output_log.txt
DxDiag.txt