0.12.12 - Win10 - Ascending a specialization does not grant its creature skin or decoration

Upon defeating all gods except Caliban to ascend the Witch Doctor (defeating Zonte last), despite getting the ingame + Steam achievements and the accompanying ascension perk for the Witch Doctor, I did not receive the creature skin or decoration as drops from the fight, nor did I get the usual congratulation message for ascending the class. Attempting to fix this and receive the skin + decoration by going into the Gate of the Gods again and defeating some of the gods a second time was not successful.

EDIT: Ascending Reaver after defeating Anneltha last resulted in the same bug, so it appears to be global to all specializations and gods. Amending the thread title to reflect this.