Hi nullbot, sorry, do you mean you only get this problem for LAN sessions with Steam and it doesn’t occur for internet sessions? Or perhaps you just only tested it for LAN?
I had what was probably the same issue, but I don’t think I ever tested it for LAN, only internet sessions.
Anyway, if it happens for internet sessions too, so far as you’re aware, then I was able to get around it with a small engine modification which I can share with you.