There's a running trend out there about True Polymorph/Wish and Adult Gold Dragons. My character is classified as Goblinoid, however, so I ran into a small condundrum that I think I know the answer to, but it's not one I very much like, so I wanted to outsource it: If a non-humanoid, non-beast creature were to be true polymorphed or wished into the form of an Adult Gold Dragon, would that dragon be able to turn back into its previous form using its Change Shape ability?
Relevant Quotes (emphasis mine):
The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the dragon's choice).
Side note: Admittedly, it's not like you're losing out if you're now a dragon, but it can potentially mess with certain role-playing aspects, like never being able to look like what you once did so your parents don't recognize you anymore, or a spell is cast so that the trigger is your old body entering a certain radius of it, etc.