Android 12 - app notifications fire and immediately leave the tray for this app. Other apps work OK

I have an android app whereby notifications will fire and immediately leave the tray. This doesn’t always happen, it’s unpredictable they do sometimes stick around. It happens on android 12 but not 13. I don’t think it’s about the battery manager as I’ve read elsewhere as other apps than the one I’m trying to debug work fine.

Has anyone seen this? Any suggestions in terms of the app config / manifest / permissions that might cause this issue?

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