It's a repeatable bug, so I don't think it was just a glitch.
When stuck in the doorway, if you crouch the world goes away, the NPCs and Players are there, but the world is gone, and underground, and if you step backwards you fall off the ledge and fall and fall, your character yelling.
I fell while trying to write a bug report until I got booted offline for "spamming" and when I logged back in, my character was still falling in the void until I /stucked.