This bug has been around for a long time but only really started to bother me a lot lately.
When you get a pick up item in a mission, there is something done to it that will not allow you to sell it from inside a backpack. Basically you have to take every mission pick up item (which you get to keep in observe item missions) out of the backpack and put it in main inventory then sell it from there. The exact same item will be sellable from in your backpack if you got it some other way like as the mission reward itself (the thing you were rewarded after you picked up the pick up item), bought it from a store, or got it out of a chest.
At one time this behavior used to be useful since it would allow you to figure out which nano crystals were "permanent" and which were not. Now its just an annoyance. Any chance we could get this fixed?