Man, the Forbidden Woods area is def the buggiest area in the game. It's definitely much much worse when trying to coop. There was one game last night where the shortcut elevator just didn't work so I was stuck at the start of the level while two others fought the boss. Any time I would go into the shortcut room the entire floor was invisible. But by far the craziest shit happened to me when trying to help a friend with the boss. Here's a sequence of events since you might be confused when watching this video.
https://www.youtube.com/watch?v=_XZVzz8Sdzc
1. Here I am helping a friend with the boss. He finishes the boss right as three fireballs kill me. You'll see that I still get credit for beating the boss, which at the time was pretty awesome. My blood echoes and insight go up and I head back to my own game.
2. When I respawn, instead of being back at the lantern where I started, I'm back in the boss room. I've never even gotten close to locating the boss in my own game. I panic and intend on using an escape item and accidentally use the hunters mark. I die right as the animation for escaping is finishing up.
3. The third respawn is back in the boss room, yet again. Only this time the three hunters are just standing there doing nothing. I cut some of this part out since a lot of the time I was just laughing and waiting on a friend to watch it via share play. The crazy thing is that my blood echoes are retrievable and despite not having health bars on screen, all three hunters are killable.