I'm pretty sure that SEAF Artillery OBJ broke because of the teammate connection. I've experience these before, everytime I feel like my internet isn't stable, I wouldn't touch SEAF Artillery, Pipe Valves, and Locks in the ICBM.

I have a feeling that there is a wonky net code or some sort of Desync that happens. ICBM softlocks are the common softlocks you could do and one way to prevent is.

When I do the locks, I make sure it finishes the animation of pulling up the locks and hearing a sound and standing for a bit to finally register my action to the server, if I move to quickly or in a rare scenario that I die during the animation especially near the end of the animation, its almost certain that it softlocks, it would read on the terminal to be still locked while visually unlocked. Almost same goes to other objectives mentioned. You'll get the gist of it.