It is kind of confusing. When the first recipie overhaul took place we were left with a lot of broken synth chains. E.g. Before you took Ore to Nuggets to Ingots to Wire to Chain. Now they made it so it is Ore to Ingots to Chain. The Ore to Nuggets and the Ingots to Wire still works, You just can't use Nuggets to Ingots or Wire to Chain anymore.