Showing the white tracking arrow vs. the blue background to time when GPS-tracking

I see a difference between iOS 15 and 16 here, where on 15 it shows in the same configuration the white arrow while on 16 the time in the top-left has a blue background. So I was wondering how it comes to that and what the exact behavior to this is.

Showing the white tracking arrow vs. the blue background to time when GPS-tracking
 
 
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