I have some apps, i.e. Unifi Protect, that requires access to background location to send activity alerts when nobody is home, and i frequently get alerts that this app has used my location in the background, and despite selecting "allow always" it will pop up again in a couple of weeks.

To further add insult to injury, i appear to have "trained" my wife so well that she defaults to selecting "deny" for apps she doesn't use, and "only when in use" to everything else, which then results in a flurry of motion alerts :)