I'm also having problems with my ZF9 Bluetooth and car.
It was working fine last week until I did this recent OTA FW update.
Now I cannot make calls from my car.
My phone connects to my car, shows up, I can access contacts etc. All looks good, but if I try to call anyone it looks like it's making the call, it dials the contact then just goes back to the standard screen like it's not doing anything.
However it has actually made the call on my phone but isn't connected to the cars speakers and my phone is connected to the contact. But I cannot hear anything.
I have to manually switch from Bluetooth audio on my phone to phone speaker.
To totally unsafe and frustrating, especially as it was fine before this recent OTA update.
Also since this latest update I can no longer use the "screen cast" built into Android 12. It was working fine last week before the OTA update.
Now it's broken.
Looks like something went quite wrong and I'm now regretting buying this stupid phone.
ZenFone 9 16gb/256gb version UK spec WW_32.2050.2050.29
Please test updates before you send them out.