ServiceExtension notification will be discard if APNS payload without title and body

Hi All,

I have encountered one issue for Service extension APNS payload. what we want to do is to surpess the Serviceextension Notification and compose programmatically.

If payload like:

{"aps": {"alert": {"body": "", "title": "Test"},"mutable-content": 1}} or {"aps": {"alert": {"body": "", "title": "Test"},"mutable-content": 1}}

then it will get delivered to Serviceextension,

But if the below payload, then it will not get delivered to ServiceExtension

{"aps": {},"mutable-content": 1} or {"aps": {"alert": {"body": "", "title": ""},"mutable-content": 1}}

Why have to specify title or body in the payload?