Palace of the Dead Luring Trap triggers before even loading into the instance

[GwynUnlucky]

Wait... where was the trap?
Was your character set to somehow spawn on top of the trap? Or did one elsewhere somehow trigger?

Either way, I'm sorry for your loss.

I believe the monsters had walked from an adjacent room into the starting room and were able to attack before the blue loading circle had disappeared. I'm unsure of the compass direction that room was locationed in, but it implies a distant trap triggered on it's own (unless somehow the trap was in the starting room and the monsters just spawned in an odd location; since we're dealing with a clear bug either way I wouldn't take that possibility off the table)