That would be the action entity which is present in the MQTT payload, but not sent to HA.
Unfortunately, that was disabled by default since the end of last year when Z2M 2.0 was launched and is marked as deprecated (though you can still re-enable it in settings)
This section of the docs explains the 3 possible options you can currently use to detect movement - event (experimental), MQTT device trigger or action (legacy).
Personally, I re-enabled the legacy action entities for now, though I’m fully aware that I’ll eventually have to rethink my choices when the option is removed. I guess that’s a problem for future me though.
If you want to read more about the other options, this thread explains it quite well and includes some automations for the new options.