Affects Version/s: Minecraft 1.12.2, 1.15.1 Pre-release 1, 20w12a, 20w13b, 20w15a, 20w17a, 1.16.1, 1.16.2
Fix Version/s: None
Since the beginning of version 1.12 and the introduction of the Recipe Book, there is a bug related to this book that prevents ingredients containing NBT data from being automatically transferred to the crafting grid when clicking on a book.
The following video shows the bug with leather containing a compound tag :
The recipes are normally not sensitive to NBT data, which allows the recipe but prevents adding the ingredients.
The error is only server side and related to a player inventory method that is only used for the recipe book.
Related MCP Mappings :
Affected method: net.minecraft.world.entity.player.Inventory.findSlotMatchingUnusedItem(ItemStack) (Mojang name)
The check Inventory.isSameItem(ItemStack, ItemStack) makes all subsequent checks irrelevant.