Respuesta del chat de Microsoft:
Hi there My name is a fellow Xbox Gamer. I'm sorry if you're having this kind of issue but I'll be more than happy to help you out today with regards of your concern.
Just to share with you that you're not the only one that's having this kind of concern right now.
Multiple players too that own the Xbox 360 version of the game are reporting this issue, for now there's no statement about it yet and the best option that you can consider is to submit a report for it through the
https://support.rockstargames.com/request about this issue so they can provide the free upgrade for Xbox 360 owners too and wait for their update.
You can also submit a report for it here in
https://support.xbox.com/en-US/xbox-live-status to notify the Xbox developer team about this issue so they can communicate with Rockstar to provide the update for this issue as soon as possible.
I hope for your understanding and let me know if you have questions, take your time

En resumidas cuentas acceder a este enlace y reportar directamente a Rockstar
https://support.rockstargames.com/requestEdito: Le he preguntado de quién es el problema y evidentemente es de Rockstar esto me ha dicho el agente:
"yes mate, it will actually depend on Rockstar, cause it is a specific promotion from them. You need to contact them as soon as possible...."