A monster died and dropped loot there. Got in by sidling next to the wall. Can’t get out.
Devs should make an item that you can consume to return to last whisper. Perhaps impose a huge penalty when using. it.
I managed to get out by exiting to menu, clicking Continue and immediately spamming dodge roll. I clipped through the chest.
Devs could make you able to climb chests. Would fix this.