Ardechoix Perhaps this may help in finding your answer (in addition to having that exact type of rounded background with an exclamation overlay image in the grid of icons provided by the article's author half way down):
These icon changes align with the status bar icon updates Google rolled out in Android 16. Despite the update on the phone side, Android Auto’s icons continue to carry on the older appearance because these icons are stored as part of the Android Auto app rather than being derived from the phone. That is why you might already see different icons if you use a Samsung phone. However, most other Android devices, including Pixel phones, still use the outdated set.
Dated: February 16, 2026
https://www.androidauthority.com/google-android-auto-icon-upgrade-3641198/
Either way, this in upstream issue.