Heavily related to this question, I want to know if multiple castings of True Polymorph would stack if made permanent.
Picture this scenario: (Assume a willing target.) Any given character is TP’d into a T-Rex, whoever cast the spell maintains concentration long enough for the spell to become permanent. Either they or another character then cast the spell again targeting the T-Rex, TP’ing it into another creature, such as a giant ape. The second cast is also made permanent.
In the given scenario are there multiple layers now? If you were to dispel the TP on the giant ape would it then turn into a T-Rex or back into its original form? If it turns back into a T-Rex would this mean you could theoretically stack layers of TP ad infinitum?
This question is distinct from the linked question as that one seems to be asking about non-permanent instances of the spell.