I have 5 masteries completed, and three remaining (French 11/15, Mongol 12/15, Rus 11/15).
But for some reason, I cannot progress any more.
I am sure, that there were a couple of games where the condition was reached, but it did not trigger the mastery progression. (Games were played in 3v3 multiplayer).
Can I do anything to debug/get the progression working again?
Previously, my computer had issues with OneDrive, where I had to unsync the OneDrive backup, where as I only noticed later, the files from My Games were also included. Not sure if this is relevant for the issue.