Another co-op bug:
This
was reported on Steam by another user, but I'm having the same issue.
When sitting on a bench in a co-op game, the host's character bugs out. The host can see me sitting normally, they can also see themselves sitting normally. I (as the joiner) can see myself sitting normally, but the host always appears to be walking in place inside the bench.
We have tried this on multiple benches and the issue is always there in that same manner. Although you can't see the animated movement, here is an image: