Within the past hours i found some doors, which does not open after killing the bosses:
Siege of Orgrimmar - After killing Iron Juggernaut the doors to Orgrimmar do not open anymore.
Tomb of Sargeras - A guildmember told me, that he got stuck aswell, he ran the raid the past 3 weeks to get the raid skips on each difficulty, so i doubt he does not find the mechanics
Nighthold - After killing Skorpyron, another door event which needs to spawn some NPCs who open it, doesnt trigger as well. Last week i got it to trigger by running back and coming back, this time not. I just used my raid skip to proceed a bit, but something seems broken more now 
It’s a common issue when farming old raids and it’s usually caused by you killing things too fast. The raids just were not designed to be run that way.
Gives bosses a few seconds to fully engage in combat with you and if a fight involves NPC 's allow time for them to get in involved in the fight before you kill the boss.
Basically when you kill things too fast sometimes the fight mechanics haven’t had enough or any time to start and that’s what usually bugs the doors.
Sometimes things bug out too. Dragon Soul sometimes bugs and you can’t knock the plates off the spine. You have to exit the raid and click Reset Instances and go try again if this happens.
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