The logic in this app is configurable so that if at least one of your geofencing solutions departs, the combined sensor can be marked as departed, even when one of the underlying sensors is “stuck” as present.
Since this thread is dedicated to discussion about one community developer’s solution to the problem of mobile presence (which in my experience isn’t limited to Hubitat), please consider asking more general questions like this in a new thread.
Or better yet, here’s a thread that was recently created and was meant to be a discussion about presence sensors in general (including mobile presence). This thread would be a great one to have a further discussion about the pros and cons of Hubitat’s built-in mobile presence solution.