The guns of reliance glitch borderlands 3

On the guns of reliance mission I am stuck on the KILL LONG ARM THE SMASHER objective. It has a check in the box but is not moving forward to the next objective. Anyone know a solution?

Exit the game to main menu and go back in. I didn’t lose any progress, the mission just went on as normal.

I exited the game and restarted but still have the same problem.

I fast traveled back to Sanctuary and then back again, it respawned them all and then it worked the second time.

It finally started working right now. I started a new game with a new character and played that for a week or so. Then I loaded the game that was messed up and it resumed the mission… successfully