iOS Notifications can get voice prompt, but without infos(notification prompt box)

When our app get notifications, Our devices(iPhone/iPad) can get voice prompt, but without infos(notification prompt box)! I really cann't figure it out why!

The above phenomenon will appear when the APP is installed, but the phenomenon does not exist when the APP is deleted! I wonder why? I do not know how to solve!

Everyone I asked says it's apple's bug!

iOS Notifications can get voice prompt, but without infos(notification prompt box)
 
 
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