There's always a chance that something will break with App-ID if a vendor changes things on their side as I'm pretty sure they don't ring each NGFW vendor and say here are the changes to our app, better modify your application signature. On occasion, PAN will be aware of the changes and will make a note of upcoming changes in the weekly release notes. If you don't receive the release notes via email I'd suggest you add them to your profile as they can help minimise App-ID related issues, provided you keep tabs on documented changes.
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