1. When trying to talk to True Soul Nere after the battle to complete the quest, Nere does not want to communicate.
And it is impossible to complete the quest.
I assume this is because during the fight one of the opponents drank an invisibility potion and disappeared, but this is not certain.
2. Minthara's battle cry "In the name of the Absolute" after being rescued from the Moonrise Tower when she no longer believes in the Absolute is a bug
3. If you kill Balthazar before talking to him, three scrolls of Speak with the Dead will spawn on his corpse. But at the same time, the quest to talk to Balthazar will be active. It is impossible to talk to him using this spell, as he is undead - the quest is broken.