Really? I've seen it quite a few times when I was switching back & forth between verizon, sprint & at&t. Sometimes the notification comes & goes so fast I log it with.

https://www.f-droid.org/en/packages/com.nitish.privacyindicator/

This will log every notification you get & also notify you when an app uses your camera, microphone, or location. It's a great app to have!