I did the entire quest, took me ages! I hate puzzle solving but I forced myself through it all and in the final room where you have to destroy all the mechs to overload the system, I destroyed all the mechs and then nothing happened for 5 full minutes. Thats the bug.
I will need to take a vacation for one month and come back to force myself to sit through that mission again, and if it bugs out again, I am uninstalling the game.