I know that the recipes for synthesizing copper nuggets to copper ingots have been canceled for Blacksmith & Armorer. I tried using Goldsmith to convert copper nuggets to copper ingots, but I was unable to do the perform the synthesis. (5 copper nuggets & fire shards to copper ingot)

You get the same message for all three jobs (Blacksmith, Armorer & Goldsmith) "You cannot synthesize with those materials".

I don't know if this recipe was canceled across all jobs (and was missed in the patch notes) or if this is a glitch specific to Goldsmith.