There are tons of recipes missing in the material reducer, including netherite, the new sculk, and many others. 

Steps to reproduce:

1. Try to put a copper ingot in the material reducer.

The missing copper recipe is just the most annoying. There are a lot more.

Expectation:

The copper ingot drains down into 100 blocks of elemental copper.

Outcome:

I can't place the copper ingot in the reducer.

(This is a repost. I accidentally posted this in MC instead of MCPE.)