I changed professions before turning in the shadowghast quest and noticed it only unlocked recipes for my old profession/the trainer I turned in the runeforging quest to. It seems like shadowghast is only unlocking for a single profession. Do any recipe vendors offer shadowghast stuff?
Opened the following for my issue.
https://us.forums.blizzard.com/en/wow/t/changing-shadowghast-armor-profession/745518