If you group everything together, this cant happen as long as one of your other trackers are home and you are using the state of the group for your automations and alarming.
For example, this is in my groups.yaml file:
tracker_gregg:
name: Gregg
view: no
entities:
- device_tracker.gregg_phone #Gregg GPS Logger
- device_tracker.gregg_phone_wifi
- device_tracker.gregg_phone_BT
In my setup, I use the state of group.tracker_gregg to arm, disarm, etc. If the BT device tracker goes to “away” or “not_home” or whatever, it doesn’t matter because I will still be home on wifi and the GPS Logger tracker. One single entity in that group being home makes the state of the group as home. With this setup, your configuration should never directly reference the BT device tracker except in the group itself.
Straight from the Home Assistant Docs HERE:
Group behavior
When any member of a group is on then the group will also be on. Similarly with a device tracker, when any member of the group is home then the group is home.