Also have not experienced this at all. I only get new Siri in carplay.Am I the only one having issues with new Siri and CarPlay? It seems like with new Siri active, old Siri and new Siri are BOTH active.... or at least some of their animations and sound effects. With new Siri, if I tell her to text someone there is a good 10-15 second gap before she asks what I want to say. That same delay occurs before most voice prompts. And throughout the process, it seems like two different sound effects are playing, with one preempting the other. At one point, ALL sound stopped including voice prompts. This was not resolved when I disconnected the phone and re-connected in the car's BT settings. It was also not resolved when I closed messages in the phone and re-launched it. Turning Siri off and then on again partially cleared it but the messages screen in the car was blank.
I finally turned Siri off and then back on again. I then selected OLD Siri when it asked and everything went back to normal.... no delays and no overlapping sounds.
Just me? Or should I send feedback?
Try updating (not restoring) from recovery using the IPSW maybe?