Every now and then I run across some weird pickable objects displaying the wrong graphic. I cannot figure out the cause of them, but they never bug out while I am the one picking them. I am guessing that Hurricane season winds are to blame for the images where something that looks pickable is in fact already picked. The object is no longer animated and can only be examined in those cases. I don't have a good guess why my third image had pickable grass that looked picked already though. At first I suspected the DoyDoys, but they haven't done anything to reinforce my suspicion. I only caught this bug once, and it was with a grass tuft that I had not dug up.
I think it is the hurricane winds that cause this problem because it is picking the pickables in a way that the game may not always understand.