I had this exact same problem. Here is the shot of the experience bugging out.
And the shot of losing reputation. I was around 50% into A and lose almost all of B.
Further bugs with this mission. The “limited time” shows as 0 minutes always. Also, the mission does not go away when you finish it like the other yellow diamonds. Normally, these missions unlock missions across the world once you finish.
The brutal punishments in this game combined with bugs is absolutely killing the game. They need to disable punishments until they can fix all the critical bugs like random plane crashes and stuff like this.