When asking Siri to open one specific Matter smart lock, it opens all smart locks instead.

Besides a couple of Philips Hue and other devices, my Nuki Ultra smart lock and SwitchBot garage door opener are included in my Apple Home environment via Matter, and work fine for themselves. Both are assigned to different rooms, and I took care for very different naming (i.e., "Haustür" and "Garagentor") so that Siri won't get confused.

However, if I ask Siri to unlock the Nuki smart lock (alone), Siri opens both locks. Plus, my iPhone confirms via a text that Siri has successfully opened *all" locks - which is not what I want.

All device firmwares and apps are up to date, and my iPhone 17 Pro and Apple Home Pod mini run the latest OS. All other Apple Home devices and features run just fine.

What do I need to do to make Siri open or close only the specific device I am addressing? Any helpful comment is very appreciated.