Whenever using Transparent Cosmetics alongside Cosmetic Armor on a dedicated server, relogging causes the transparent armor to become invisible in its respective slots, clicking the slots causes the armor to reappear...
Also whenever somebody equips transparent armor, you have to relog to see the effects...
And finally, there seems to be a randomly occuring issue where the transparent armor will be set to "air" with a count of 1 inside of the player's playerdata, causing them to be unable to join until said count is set to 0.
I have no clue whether this is Trinkets, Cosmetic armor, or Transparent Cosmetics...