Create a custom recipe with another custom recipe as one of the ingredient items and try to quick craft it, this will not work because custom nbt items will not work as ingredients for shaped recipes when quick crafting. This is known to me to be a client sided bug of the crafting book not checking NBT correctly, you can manually craft the custom recipe, but the book shows it as red. Please fix this, i have a java plugin where i make custom foods, and this bug is holding me back from finishing, it confuses players into thinking the recipe cant be crafted when in all reality, it can, but only manually.