DC class description mentions Divine Champions gaining proficiency in ALL types of armor, but DC's only gain Medium & Shields.
Steps to reproduce the Bug:
Take a level of Divine Champion.
Expected Result:
To receive all armor proficiencies.
Actual Result:
Only receive Medium & Shields.
Screenshot(s)

Additional Notes
There's a nonzero chance that this is working as intended, as vanilla CoT's don't gain H. Armor Prof. by default, but the class description for Divine Champions was deliberately changed when the name went from CoT to DC to read "all types of armor." The special DC-only armor is also Heavy Armor as well, so I presume it's intended for DC's to actually receive H. Armor Proficiency by default (it'd be a little weird for them to be unable to actually use their class-locked gear, especially considering it's arguably the most expensive suit of armor in the game with its double mithril dust cost ontop of still needing adamantine.)