It looks like the latest build of World of Warcraft Shadowlands on PTR has made a few Warlords of Draenor crafted transmogs effectively unobtainable.
Writes u/Codeosbuya on r/woweconomy,
“Buried deep below the Wowhead Shadowlands Pre-Patch Build 35917 spell changes, I noticed that many of the Warlords of Draenor essence consumibles to improve the crafted gear using the BoP materials have become grey quality (EDIT: THEY CANT BE USED IN THE PTR AND SELL FOR 0c) and the associated spells in the profession tab have been moved to Uncategorized (AKA, removed).”
Codeosbuya continues, speculating on why Blizzard may have made this change. They postulate that this may be to removed unintended behavior with Relic of the Past V when applied to Warlords of Draenor gear. And, as they note, this has the knock-on effect of rendering crafted transmog WoD gear unobtainable.
“In case you are unaware on how this system works, WoD crafted gear had 6 possible upgrades, using consumible items (named essences) to improve the ilvl of the item. Some unique appearances were locked behind Stage 2 and Stage 3 of the item. If this change is final and WoD essences are removed from the game, Stage 2 and Stage 3 appaearances will be, effectively, unobtainable in Shadowlands.”