Hello,
it just happend to my that my chopper ore disappeared.
I placed it in the melting by the blacksmith to get chopper bars.
After a round of farming, i wanted to get them back.
Unfortunatly my inventory was full but i still was able to take them back in my inventory what leads to let them dissapeare.
I thing there is no back check if the inventory is full to stop the player to get it back.
best