I don’t know if this is a bug, but when I disassemble the Rhino travel saddle heavy item, it gives 100 obisidian 3 layered silk and 7 thick leather, but it only wants twine, Layered silk and thick leather in its production.
It sounds like a bug indeed, thank you for reporting it! I’ve just tested and I can confirm your findings:
Crafted with:
Dismantled into:
