I cannot trade smelted stone.

In my server, which I've had since the Village and Pillage update, I cannot trade smelted Stone with my Stone Mason. I've killed it and bred a new one, switched my texture pack, smelted new stone, and restarted the app, but I still cannot trade Stone with it. This has happened since I downloaded Version 1.12.0. Is there a way I can fix this? Thanks!