Today we've released the planned 0.50.3 patch to the game, which fixes the issue around some mission objective quest text that was missing.
We're aware that there are still some instances where quest text isn't fully appearing as intended, although in these cases the objective locations should still be visible once you take the train to the relevant map.
We expect this to be fixed in 0.51, which is due towards the end of July, and is the build the team is now working on. Happy Hunting!