A few more I tested:
<span style="font-size: 10px">Chapter 5 of the undead campaign (The Fall of Silvermoon)</span>
When you try to build a high elf barracks with a (possessed) elf worker, it stops immediately after starting. When you try to target it with (the high elf worker's) Repair it says "Unable to target organic units".
The high elf towers (which you can build with a possessed worker) have no build/birth animation.
<span style="font-size: 10px">Chapter 2 of the blood elf campaign (A Dark Covenant)</span>
There are three doom guards that walk near one of the observatories but instead of destroying it, they just return back to where they came from.
I assume this is a bug in one way or another because they literally just go there and come back from where they started, and that they are intended to destroy the observatory.
<span style="font-size: 10px">Chapter 5 of the orc campaign (The Hunter of Shadows)</span>
In normal difficulty, there are ~6 wisps waiting outside each mine, doing nothing the whole game (from what I noticed, the mines were often empty).
Regardless of difficulty, none of the AIs rebuild their ancients of war/lore, only the blue base rebuilds their tree of life, and dark green their chymeara roost, yet all three of the them rebuild their altars and hunter's halls (the 2 buildings that have the least impact on the game).
All three of them use AOW units in their attacks, and after dostroyin all AOWs, you are left with attacks of a couple chymeara, couple uprooted ancient protectors and a handfull of dryads at most (those were 3 separate attacks, which seems unbelievably easy for a hard mode mission).
Often, the AI would glitch out and Cenarius would stand in one of the bases (dark green, when I tested) along with a few units and do nothing to help the others, like it is supposed to.
It eventually returned back to normal when I attacked him and the other units nearby.
<span style="font-size: 10px">Night elf campaign</span>
Corrupted ancient protectors dont turn around when attacking, unlike the regular ancient protector.
The other corrupted ancients dont attack at all when rooted (because of ROC mechanics), so they are ok.
I also noticed that when you pick up tomes, they leave a tiny (barely noticeable) tome of the same type at the same position but I think that one has been said a dozen times already.