just had a dwarf forget to throw stuff into the maw?? they just went up to it and rested still with all the stuff on their head and then went to gather more (and got stunned i think, it was hard to pay attention). the top item was an artifact, idk what exactly caused that
I think this could happen in the very rare case the runner got stunned during the post-deposit wait timer I recently added, and then when he went to deposit again the timer didn't reset so it made him think it's time to rest. I believe I have now hopefully fixed this and it's not because of another reason. It will be up in the next patch. Thank you for an informative report!