700.8b If a creature has multiple creature types for which it could be the party member, it is counted as the party member for only one of those types. If there are different ways to count such a creature that results in different numbers of creatures in a player’s party, it is counted in such a way to get the highest result.
Thanks, didn't know that. It is not well documented tho, at least not in the way the ability is described.This is working as intended. The party mechanic requires one unique creature to fill each role in the party. It's well documented that playing a Changeling does not immediately give you a full party.