On SoD, I completed the new questline for goblin schematics as a gnomish engineer. I went with the Goblin Mortar as my first schematic and the reload is suppose to also be taught when you learn the mortar. This wasn’t the case and I am only able to craft new mortars and not reload them. https://www.wowhead.com/classic/spell=13240/the-mortar-reloaded#taught-by-item