Dreadscar Rift (Warlock Class Hall) Causes Game Client to Crash

There is two other threads on this exact same thing:
https://us.forums.blizzard.com/en/wow/t/dreadscar-rift-crashing/1550213/9

https://us.forums.blizzard.com/en/wow/t/logging-in-causing-game-to-crash/1550330