This list is not inclusive as there are a lot of them, but some of the ones that have the most impact and have been made public.
Unholy DK
The Commander bug appears to be fixed.
From the Acherus Death Knight Discord, the Unholy community has discovered an issue with one of their talents, Commander of the Dead. Our Unholy DK writer, Taeznak, explains the bug in the pins of the Unholy channel:
Basically, we are losing a MASSIVE chunk of damage during cds because commander isn't being applied to our pets as soon as they spawn.
The Unholy Death Knights have determined that this talent is taking a long time to apply to their pets, losing them a significant amount of damage, especially during Army of the Dead. The current workaround is apparently to use Dark Transformation before using Army.
In addition:
Dread Plague / Virulent Plague still aren't ticking right when being extended. They just made Mograine more consistent by making it so it seems like it ticks every 2s flat... so, losing like, 33% of the ticks while Mograine is active, and more randomly sprinked through the fight by other extensions
Preservation Evoker
The Preservation Community has determined that Stasis is no longer capturing or duplicating Dream Breath.
Stasis is a Preservation Evoker cooldown that remembers the next 3 healing spells used, and upon reactivating the ability, quickly uses all the remembered spells. With the ability being unable to remember one of the core Preservation Evoker healing spells, this is a problem especially in end game combat.
Holy Paladin
Holy Paladins have reported two bugs. One appears to be Holy Armaments causing major FPS drops, and if this happens, players have to change specs and then back to holy in order to fix it.
The second bug seems to be a missing damage hotfix that was added in 12.0.1 which buffed Holy Paladin damage, causing this spec to do less damage.
Mistweaver Monk
There have been reports from the Mistweaver community about talents randomly being disabled in raid including Refreshment, Uplifted Spirits, Unity Within, and Chrysalis.
It's unclear what causes this or if it affects Mythic+.
Devourer DH
The Sweet Suffering change has been fixed
Devourer didn’t receive the nerf to Sweet Suffering that was intended, and Devour is also generating ~18 Fury instead of 10 Fury.
The community is unsure if this is intended.
Windwalker Monk
Zenith Stomp benefits from Mastery but doesn’t contribute as a unique spell to keep it going, so doing X > Stomp > X will drop Mastery/Hit combo
You can’t use Zenith during Zenith (good thing) unless you’re talented into Drinking Horn Cover, at which point you can use your 2nd zenith after 16s, overwriting the previous one and not getting your 2 Zenith Stomp charges
Buffs are randomly disappearing from the CDM unless you default back to the base profile and try again
Restoration Shaman
Resto shamans only got a 15% damage increase even though the notes said 30%
