I initially configured nmap_tracker to solve location detection intermittency on my iPhone. After doing so, my known_devices.yaml file filled up with all of the included mac addresses on my network. Since I excluded my MacBook from the list, the services that my MacBook was running were no longer detected by HA.
Specifically, spotify. The spotify service was not updating based upon what I was listening to on my MacBook. So, I removed it from the exclusion and everything came back to normal.
hosts: 192.168.1.0/24
home_interval: 5
exclude:
- 192.168.1.1 - AirPort
- 192.168.1.5 - Other thingy
- 192.168.1.15 - Some other thingy
- 192.168.1.13 - Pi3 / HASS.IO