so i was playing the sub mission "becoming the future" and every time i destroyed the comet, instead of breaking up into 3 fragments it would simply disapear i have tried to play the mission 6-7 times now and the same thing happens every time, does anybody know any fixes for this glitch?

It's nothing a player can fix, unfortunately.
This bug has been there on and off for some players.
Even though I've been lucky enough to never run into it myself I know a friend of mine has it 100% of the time.

In addition to disappearing comet fragments I lose all weapons after first encounter with the enemies. Hopeless.

well i guess i'll just have to skip it i supose, too bad i would have really liked those retrofit guns