Blizzard has posted hotfixes for today which includes fixes for pet classes benefitting from damage buffs in Mythic+ dungeons.
Hotfixes
January 24, 2023Dungeons and Raids
Algeth’ar Academy
Echo of Doragosa
Fixed an issue causing Overwhelming Power to not increase pet damage.
Shadowmoon Burial Grounds
Nhallish
Fixed an issue causing Returned Soul to not increase pet damage.