Same issue here, but unfortunately entering whilst stealthed hasn't work for me :¬/ all the mobs as I get in are still hostile. I also didn't even steal anything, just opened the door.
There's another way into the room through the temple bit, if you sneak there's a little pink/purple thing that appears on the wall in the room next door, then a secret door opens. So you don't actually need to do the main door.