Can confirm that on iOS (specifically iPhone more than iPad) my ad does not make the game pause in the background. Also that my Sprite Fonts aren't always rendering. Also that my 9-patches aren't always rendering. Sometimes they do, but it's inconsistent.
And then sometimes the audio cuts out for the rest of the session.
I've just recently had Apple tell me that by latest build is bugging out during the C3 loading screen on iPad OS 15.2, so I updated my iPad and didn't see anything. Sent them a video but might send them this thread so they can see that the construct team believes that Apple broke iOS, so Apple can realize it and fix it. That is, if Apple cares about C3 developers. What say we? I doubt it, from my limited experience with them.