iBeacon Exit

I read on the companion documentation:

“The app has basic support for using iBeacons to trigger enter/exit updates”

and after a few lines

" It will then begin using iBeacons instead of your location for enter (but not exit) triggers around your zones"

(not Exit?) I can’t understand the meaning
I test it with notification ON in the app for both Enter and Exit but I received only notification when Enter.
My Test iBeacon is isolated, no no overlap or proximity to other areas.

I need to open a gate when I near to the IBeacon but close it when I leave the area
Thanks.
MArco