Well, I just turned a mission in & it didn't, so I was incorrect I suppose.
I actually was going for a shock Sand Hawk a few days ago, and got one first try, but when I took the gun, it auto saved. I paid attention to know for sure if it would if I wanted to do it again. I don't know why it auto saved that time. Honestly, that's the first time I ever paid attention to that, because I haven't dashboard reward farmed at all. That was going to be my first time doing it.
Would you like to do battle with a Brony riding piggyback on a Rabid Stalker? If the answer is no, you are sad, and I've no desire to speak with you further.