Hi, sorry I would log this with the in game bug report but I'm having trouble logging into that at this time.

I have successfully completed the Return to the Martyr mission twice on my Crusader but both times the progress is not saved. Once I click on the leave mission button after completion, the game loads out and skips the reward screen. I am then back on the Command Bridge and the mission Return to the Martyr is still there with no following mission available. 

Both instances were completed after the version 1.01 patch and both on Impossible difficulty. I was also able to complete a standard mission without issue.

I will be attempting some testing to see if I can get it to work, will update with any further details. Thanks.