I found this bug 2 months ago,and i want now say about that beacuse it dont fixed:
When you play in server in COOP mode all normal,only for you,if u reconnect for you round "reset".
Example: map blast3r-saw all players now in parkour place and someone coming for revive you,this is some critical bug,if player going on moved door place you see he comes "though" wall but u cant untill not activate trigger on this.
It must be fixed anyway and thats just elemental bug