Quests currently not unlocking other armor types

[Tradeweppls-twisting-nether]

This was confirmed to NOT be intended on the beta and will not be a thing after all, i guess Blizzard loves us a lot

Transmog Quest Reward

I have made a new Dwarf character because I wanted to level through their starting area and beyond also hoping to unlock some missing transmog pieces. I was under the impression that as of 11.0 once you complete a quest you will unlock all available transmog, even the items that your character can not equip. However I have noticed that this is not the case while questing through the old world. Is this intended, did I maybe misunderstand how unlocking transmog works?