So I had the same issue on my Pixel 5 and CalyxOS and now also on my new Pixel 7 and GrapheneOS.
My problem was and is: The screen is black and will not come back until I force restart it. However the device is still responsive. E.g. I get vibration feedback when I use side buttons or certain sounds play, I can receive calls. The "only" issue is that the display is black and will not come up again.
I even took screenshots in this state to know what the OS "sees" in this state but these were just black.
So it seems this is a bug with Android 13. Just to summarize what I did beforehand: Went into car, AntennaPod was automatically playing on car stereo, I switchted to spotify, come home, turn car off, go inside and then I noticed this.