Has anyone else tried obtaining Shadowlands transmog items from the creation catalyst since they updated it? Is it no longer a thing or is it a bug now? I just tried to use a mythic piece of gear from one of the mythic Shadowlands dungeons and it won’t give me the option to transform it. They said that Shadowlands items wouldn’t cost Cosmic flux so I assumed I’d still be able to turn gear into tier items for mog. 
Yea i dont think you can mog mythic 0 pieces , has to be i forget either raid or m+ , in which there is no m+
mythic 0 pieces can be transformed at the dragonflight catalyst in tyrhold
however it wont be mythic set pieces itll be raid finder
also they dont cost anything to catalyst
and keep in mind youll only get sepulcher set items
Just to be 100% clear, was the gear dropped recently or did you find it in your bank from Shadowlands Season 2 or sooner? Gear that dropped before the Catalyst was even implemented might not be eligible.
Also, the piece of gear is one of the 9 armor slots, right?
You definitely used to be able to catalyze Mythic 0 gear back in SL, back when you could also upgrade it with Valor. But the rules might have changed with the new upgrade system.
Mythic 0 gear in DF now starts off as rare instead of epic and needs to be upgraded before it can be catalyzed, from my experience. Maybe this is affecting freshly dropped gear from SL.