Mobile app: device_tracker says "home" for a device which was not home for a month

### The problem

I am using Mobile App for iPhone 6S+:

This device was not physically at home for a month.
HA restarted many times since then.
And a `device_tracker` for this device still shows "home":


The “last_changed/last_updated” data is a time of the last HA reboot.
There is no any other info like "last_seen" which may help to determine if this tracker is outdated or not.

### What version of Home Assistant Core has the issue?

2022.8.1

### What was the last working version of Home Assistant Core?

_No response_

### What type of installation are you running?

Home Assistant Container

### Integration causing the issue

Mobile App

### Link to integration documentation on our website

https://www.home-assistant.io/integrations/mobile_app/

### Diagnostics information

_No response_

### Example YAML snippet

_No response_

### Anything in the logs that might be useful for us?

_No response_

### Additional information

_No response_