The pile of rusted scrap you receive from disassembling inventions does not stack with pile of rusted scrap you receive in the wild. It also causes scour through scrap to stop working if you do not have at least 5 left over from dissemble invention and try to switch to the scrap you find in the wild.
Temporary fix - do not scour scrap using the scrap you get from disassemble invention and only do it for the scrap you get out in the wild. Why don’t these stack and are they different item ID’s?