Good list. Love the comments. Couple of issues:
--Leveling pet seems to do nothing. I have leveled up to 3 with no change in stats or abilities,
--Levels are lost when resting in camp or summoning new pet
in DnD familiars never rank up. Yes, at level 20 your crab will still have like 2hp or whatever. Larian probable copied programming and killed the gain but not the notice.
--Speak with animals doesn't work on pets
They would have to specifically script this and while cool, I'll pass as id prefer resources spent elsewhere.
Goblin Raid on the Grove
--Minthara bugs out in the zorru room and is unable to initiate dialogue, drow being drow.
I have 410+ hours played and that only happened once. Couldn't figure out what was different.
Wyll Dialogue
--You learn that the Drow have taken his "contractor" from spike, but when you confront Minthara no dialogue options exist to question her about his "contractor." Wylls not the sharpest sword in the armory.
She was taken by other drow. Not sure what you are expecting here.
Halsin
--After rescuing the grove says he will accompany you then doesn't, what a lazy druid.
Huh?
--When controlling directly in the Sanctum you can not use summon spirit companion or healing spells, bear's can be rather dumb.
The bug is actually when you are not controlling him. Druids can't cast spells while shape shifted. So when he is not controlled and casts spells it's a bug.