What is going on in applet -> listitem's customExpandedViewContent

I am so ever confused by these lines…

https://invent.kde.org/plasma/bluedevil/-/blob/2e21d82a45f054ba9e41679726673a423ea17b58/src/applet/package/contents/ui/DeviceItem.qml#L201-204

    customExpandedViewContent: Component {
        id: expandedView
        // ...
    }

    // Hide device details when the device for this delegate changes
    // This happens eg. when device connects/disconnects
    property QtObject __dev
    readonly property QtObject dev : Device
    onDevChanged: {
        if (__dev === dev) {
            return;
        }
        __dev = dev;

        if (expandedView.status === Component.Ready) {
            expandableListItem.collapse();
            expandableListItem.ListView.view.currentIndex = -1;
        }
    }

What does Component's status has to do with anything? And unconditionally resetting currentIndex is probably too much in case a user has been interacting with some other list item (device) at this time.