Hi Diego
Some users (including me) experience one very odd behavior regarding Admob.
In IOS15+ the audio from the C3 app continues to play even when an Interstitial ad is shown, while in IOS14- the game was paused.
Maybe you can quickly verify this behavior and see if you can replicate.
Just create a project with a looping audio (make it loud so you can easily verify), then open an interstitial. The correct behavior is that the game should pause (and be silenced) while the Interstitial is showing, and then continue again when the Interstitial is dismissed.
For me this works fine in IOS14 and below, but not in IOS15.
Is there some change in this functionality, can you verify the behavior?
(I tested yesterday with Latest C3 and latest Admob)