Using Smelt Block trick on block without smelting recipe destroys it (replaces with air). Tested on Psi version 44. Tested only on stone.

This happens on 47 as well (the version that says fixes this)

I just smelted a stone twice, and it went poof. Minecraft 1.11.2, forge 2282

Getting same problem on undiscovered modpack psi ver 1.1-59 cooking block like entherrack make them disapear or same with cooking items for cook food, it cooks sometime the food but makes it disapear too.

I confirm this bug. for the same config as kragnoth.
In addition, debugging the item before smelting it show it as air.