To add to what happened, I was sticky jumping and hit near the middle of the door in that corner as it was lowering. When I reached the bottom from falling down I was stuck. The collisions for the corners are odd because the first bottom bit of the corner is non-solid, but then jumping further up you can bonk your head on where the collision for the corner actually starts. I think this is where I got stuck. The part where the corner collision ends/starts.