I have been playing a couple hours now and have reached Kai's crawler. He sent me on the mission for pistons which I got after a little grind but before turning in, I returned to my crawler to upgrade Mack and now I can't turn in the objective. I still have the pistons but nothing happens when I get near the crawler.
Has anyone else suffered this and if so, how do I rectify it as it has now broken the game progression. I reset the game and the Xbox and neither worked.