java.lang.ClassCastException: class fuzs.visualworkbench.world.inventory.ForwardingCraftingContainer cannot be cast to class tfar.fastbench.interfaces.CraftingInventoryDuck (fuzs.visualworkbench.world.inventory.ForwardingCraftingContainer and tfar.fastbench.interfaces.CraftingInventoryDuck are in unnamed module of loader net.fabricmc.loader.impl.launch.knot.KnotClassLoader @1dd92fe2)

Looks like they implement the same optimisation by packet behaviour.

Fixed as part of fixing #9, however there is a new visual bug.