I encountered a big game breaking bug. A guy on reddit posted this --> https://www.reddit.com/r/GearsOfWar/comments/d19skf/gears_5_campaign_act_3_chapter_3_cosmonaut/
"I did the Cosmonaut training facility after doing the first water pump side mission. Now after lifting the train bridge it’s telling me to go back there and do it again but the game won’t let me. I’m now stuck wandering the desert with no way to progress. If I enter the first room of the Cosmonaut training facility my screen freezes on the door and plays the voice lines but I can’t move. Why does the game encourage exploration and allow me to do the mission when I did if it wasn’t meant to be done???
I don’t have another save prior to doing that mission so the only way round it is for me to restart the act from the beginning and wasting all the hours I’ve already put into it.
TL;DR: DO NOT DO THE COSMONAUT TRAINING CENTRE UNTIL AFTER THE TRAIN TURNTABLE
Edit: after reloading the checkpoint I was able to get into the first room but now I’m stuck AGAIN because there is no prompt to send Jack through the vent"
I have the exact same problem.
@ The Coalition… are you even aware of this? when can we expect a fix for this mess because at the moment i can not proceed because of this story breaking BUG.