A World of Warcraft bug has caused big nerfs to some classes in Fated raids

pcgamer.com:

Shadowlands Season 4 has finally arrived in World of Warcraft. It's not unexpected to see a few bugs that need ironing out once a major patch goes live but it seems some classes and specializations aren't functioning as they should while inside Fated raids. As one of the main features of the new season, this is clearly less than ideal.

Special «Fated» affixes are meant to breathe life back into the older Shadowlands raids, adding a fun challenge and giving us a reason to revisit the previously outdated content. With scaling to bring those raids up to the current power level, and better gear rewards, Fated raids are a departure from the norm of previous seasons. 

Blizzard is aware of the situation but has stated in a blue post(opens in new tab) that closer inspection has «revealed a complicated problem that we do not expect to be able to fix quickly». It's not clear whether it's the new scaling of the older raids or the Fated affixes themselves that have caused the bug, but Blizzard has stated it is a «top priority» for them fix.

The classes and specs, along with the spells that aren't working correctly while inside Fated raids, are listed below (thanks, Wowhead(opens in new tab)): 

It's not that the affected spells aren't working at all, but they are dealing a lot less damage and healing than they should be. This isn't great in any situation and it's more than a little awkward if you main one of the affected classes or specs.

The severity of the bug impacts the classes differently too. Discipline Priest, for example, relies on Atonement to passively heal while dealing damage so that's a big problem in a raid environment. Beast Mastery Hunter's Beast Cleave, on the other hand, is only used for AoE damage, so on