Leaving the shadow realm while Dracula is transitioning from phase 1 to phase 2
When transitioning from phase 1 to phase 2, Dracula will hover in the center of the arena. If you leave the Shadow Realm at that time, the next time you get inside Dracula's arena, he will still be hovering in the air, a few meters in front of this throne, in the sitting animation.
Additionally, the pillars that he breaks during that transition can still be broken once you come back (this isn't nearly as consistent, though), which may impact how the player approaches phase 1.
The fight can still start and proceed as normal, regardless.
Note : there may be additional restrictions to this bug. I was able to consistently trigger it in an online brutal PVE public server.