Homekit app

[PolymorphedCust]

Hi.
I've set up my phone (Android) with the Google Home app, and with the connection in the LM app (old) I can control every object without being on the WiFi. But when I set up my girlfriends iPhone with the Apple Home Kit and the same LM app the Apple Home objects says "No repsons" and are NOT controllable as soon as I turn off the WiFi.
Should this be a feature or is it purhaps just Apple that handles it this way.

When WiFi is off, I am still able (via my GFs iPhone) to use the Mosaic app on the LM app, and control the object, but again; all the object in the Apple Home app is not controllable.

Thanks a lot