Screen time does not always track app usage.

Screen time does not always track app usage. Last night my son was sitting on the couch with me and played asphalt 8 for right about 40 minutes, screen time shows 9 minutes. I have seen this happen with minecraft as well many times, he can be on it over an hour and it only shows 20 or 30 minutes. Sometimes it catches up an hour or so later on, other times it doesn’t. Limits cant work if it doesnt track.