I died while trying to destroy the beacons and respawned back inside the bunker with the bunker door closed and not able to exit. I tried reloading from last checkpoint and exit and restarting the game. Each time I respawn back inside the bunker with the door closed and not able to exit to destroy the 6 beacons.
After 3 hours of trying, I actually managed to beat that exact bug on PC.
I turned uPlay offline, then went to the savefilefolder and made a backup copy. Then I deleted both files (They are named '1' and '2'). After that i started the game, wnt through the now unskippable introsequence and quitted the game, when the main menu showed up. After that i deleted the newly created files in the savefilefolder again.
Then i copied the '2'-file from the backup folder back into the savefilefolder.
Now when i started the game again, the cutscene at the bunkerdoor triggered correctly. I have no clue why that worked, but it did for me.
Hey guys, just an update, we're requesting more information. Please create a ticket with your save file if possible. Thanks!