I’ve completed all 5 classic challenges for this mission on master difficulty.
All individual classic challenges (silent assassin, sniper assassin etc.) are showing as completed for all difficulties, yet “The Classics” challenges for professional and casual are both showing that I’ve only completed 1 out of 5.
Hence “The Classics 1” for professional difficulty won’t unlock. This bug is keeping me from getting the all-black suit. Really frustrating.