I have not, although I've turned on the "auto resend as SMS," at this point just to make sure I never miss a message.
Strange behavior really. The other person can send a message to me, get a read receipt, see me "typing" a reply, but no matter what it's just "sent." Never delivers until it resends as SMS (assuming of course that the send report is accurate). Also no way to know who is going to have an issue...some RCS users work as expected, others do not.
I've let Mint Mobile know about the issue, but honestly idk if this is a Mint problem, Graphene problem, or Google Messages problem.
I did recently switch from Pixel 8 to Pixel 9 Pro, but I'm quite certain that all the changeover steps were followed correctly