In WOTR the Azata spellbook - the second most popular mythic path - wasn't fully implemented until a full calendar year after release. You would plan out your strategy, use the spell, lose the spell slot and nothing happened. Nothing. 3 of the spells that actually worked were implemented in ways that didn't work. The lich path - 4th most popular couldn't completed.
And yes the super vavakia as you mentioned.
The true ending - which takes a great deal of effort - couldn't be completed and it took ~6 months for them to release hints on how to complete the game without using a datamined guide. Before then you completed research on how to get the true ending and go the message "objective complete" Uh. Thanks? When I am supposed to show up at threshold again?
I could go on, it was absolutely unacceptable. I had the BG3 save file error but when I disabled mods it went away . . . I hate that WOTR has become my favorite game
