I have heard that Blizzard is reverting the hyper spawn on invasions, so doing invasion boosting is no longer an option.
Blackrock Depths (BRD) Dungeon – Some mechanics have been one-shotting players unexpectedly, likely due to untested damage scaling, making certain fights unreasonably punishing.
Alterac Valley Battleground – While not a raid or dungeon, Blizzard had to adjust creature health and damage because they weren’t properly aligned with outdoor world and dungeon creatures
Upper Blackrock Spire (UBRS) Dungeon – A bug prevented Jed Runewatcher from spawning correctly, disrupting dungeon progression