The ownTracks docs for beacons is at [1,2], whereas there an open issue on the Overland repo suggesting something similar [3].
Getting a location [4] and detecting the presence and proximity of beacons [5] use different parts of the Core Location API.
[1]: https://owntracks.org/booklet/guide/beacons/
[2]: https://owntracks.org/booklet/features/beacons/
[3]: https://github.com/aaronpk/Overland-iOS/issues/93
[4]: https://developer.apple.com/documentation/corelocation/getti...
[5]: https://developer.apple.com/documentation/corelocation/deter...