I've had that happen quite a few times over the years with iOS devices. The only thing I've ever been able to think of is that it was a carrier message that caused the notification. Carriers do sometimes send SMS messages that aren't normal messages (for updating carrier settings, activation, and who knows what else).
this post was submitted on 28 Feb 2025
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Thank you! Even if this is harmless, the handling doesn't seem to be very elegant, so I'll have a go at filing a bug report. I've changed the notification type to "persistent" for messages going forward, so if this happens again I'll be able to capture the phone number of the message.