I unlocked the Corrupted Ashbringer Hidden Artifact appearance over a month ago. I have two different macros that allow me to track the progress of the other tints (WQs done, Honorable Kills Earned, and Legion dungeons Completed).
It counted correctly for the WQs to unlock the Red Tint, and is also accurately still counting my Honorable kills, yet when I complete Legion Dungeons on any difficulty, with the Artifact equipped, unequipped but tranmogged, in my bags, in my bank- all the macro counters AND the counter at the Paladin Class Order hall when you mouse over the other appearances ALSO ALL STILL say 0/30 Dungeons completed.
Using Darkheart Thicket/Maw of Souls as my farm spams on Normal/Heroic/and Mythic (just to see is anything would move the counter)as examples of where I’ve been to try to get credit… I also did the Legion Time walking when it was available, along with Mythic+ Court of Stars and Halls of Valor… I’m at the end of my rope and wits end simultaneously.