This is the 2nd time this bug has happened to me and both times on the teleport to the boss room I get lifted up to the cube but don't actually teleport. This leaves me trapped in the just cleared room until the encounter is complete when I get teleported to the final room.
It's not a huge issue when I'm in a group who can clear it to teleport me out, but someone mentioned it happening on solo runs too when I posted it on Twitter which traps you and you have to restart the checkpoint.
The video should show what happened, but I was also tabbed out during the clip while getting pulled into the teleport (just in case that has an effect).
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Yeah I've had this happen to me multiple times, it's annoying. You don't have to wait for the encounter to finish though, just let the adds kill you or blow yourself up and your orb will spawn in the correct room. Ruins a flawless run but beats sitting there doing nothing.