Proximity Integration not working when using device tracker device_tracker

Hello,

this is on HA 2022.12 - have not tried the Proximity integration in earlier releases.

When I use the Proximity integration with a device_tracker entity, it does not work for me:

proximity:
  boronia_tab7lite:
    zone: boronia
    devices:
      - device_tracker.tab7lite
    tolerance: 5
    unit_of_measurement: m

The proximity enitity will be created, but values are not populated:

state: not set
dir_of_travel: not set
nearest: not set
unit_of_measurement: m
friendly_name: home_tab7lite

When I attach the same device_tracker tab7lite to a person and use the person entity instead of the device_tracker, the Proximity integration works as expected:

proximity:
  boronia_tab7lite:
    zone: boronia
    devices: 
      - person.dummy
    tolerance: 5
    unit_of_measurement: m

The proximity entity now has the expected values:

state: 191304
dir_of_travel: stationary
nearest: dummy
unit_of_measurement: m
friendly_name: home_tab7lite

Am I making a mistake somewhere when using the device_tracker enitity?

Cheers,
Lutz