NbtCompound nbt = new NbtCompound();
// have to use the RegistryOps since an item is a registry entry
nbt.copyFromCodec(ItemStack.MAP_CODEC, wrapperLookup.getOps(NbtOps.INSTANCE), new ItemStack(Items.WHEAT));
Optional<ItemStack> stack = nbt.decode(ItemStack.MAP_CODEC, wrapperLookup.getOps(NbtOps.INSTANCE));