Fwiw, I believe the infotainment not responding while the reverse camera is active is meant as a feature, since you’re meant to be focused wholly on where you’re driving, might even be a regulation requirement.

As you pointed out however, in practice it really just means you’re stuck with whatever the audio setup was left at before going into reverse (compounded by the unit being made with as cheaply sourced components as possible, to the detriment of usability and responsiveness).

Some units do have a built-in feature where it’ll heavily lower the volume (maybe by about half?) whenever you’re in reverse to mitigate this.

Reminds me I’m about due to reread the Bikini Bottom Horror, ever since it came out in… 2020??

Was a spawn of the Im Sorry Jon genre(?) around that time

https://stillinthesimulation.com/untitled-comic/the-bikini-bottom-horror-chapter-1-rise-of-the-star/