It's just about 90% of the missions now. I'm only getting 20% or so of the advertised XP and Fate rewards. Seiously, If I'm losing out on XP and fate just because it's a special event mission, screw the event. Not worth my time. my last mission should have been 600 or so XP and 9 Fate. I got 212XP and 3 Fate. most the other missions are similar.
I'll test a normal mission to see if its the same.