Just as it says in the summary, when you try to harvest mushrooms, your character picks them up, but they don't appear in your inventory. This is particularly odd because they were working fine about an hour ago. I have tried restarting the game, and then the computer, to no change. This bug doesn't seem to affect red mushrooms however.

Update: found a fix. I tried placing some previously harvested mushrooms in my inventory, then tried harvesting again, they are now working like they are supposed to.