Evidently I can also only bring 7 agents to the "earlier" underwater missions even though I have Advanced Underwater Operations unlocked. Not a big problem, but it's not what I was expecting.
With the latest update, enemies in some Dimension X missions have been acting indefinitely. For their progress, I even have to click on the sign "the application is not responding" several times. So far, this has happened to me on the two final cyberweb missions. At the same time, other large-scale missions not related to changing x are played perfectly.
Not trying to contradict you, just adding a data point: I also did these missions recently and didn't come across any issues like that.