When playing with a friend as an artificer (haven't tried other classes) he doesn't have the expansion but we play the base game together. Upon spawning into a level, I initially can get out my robots and deal damage normally. Nothing visual or audio happens but I realize I'm not doing and damage and can no longer spawn in my bots although it's taking the resources and activating cool down. The dps floating text works fine but the health bar stays full. Needs to be looked at for sure else I'll lose interest in coop play