Build: Unmoded [coast] Beta Patch.
In my current Legendary ME Greenskins campaign I've spotted a few missing buildings.
The entire Walls upgrade line is missing in Wurtbad:
Troll Lair building and its upgrade missing in Karak Kadrin:
Bonus: There's some sort of bug with the Beast Lairz building whereby you always have the option of building two identical Beast Lairz buildings: