Missing label when frame in other frame or group

Hi There,
I have the following default.sitemap.

sitemap default label="Smarthome" {
        Frame {
                Text item=Clock
                Frame label="Aktuelles" {
                        Text label="Wetter" icon="sun_clouds" {
                                Text item=Clock
                                Frame label="Heute" {
                                        Text item=TempCur
                                        Text item=Rain
                                        Text item=RainProb
                                }
                                Frame label="Morgen" {
                                        Text item=TempMin
                                        Text item=TempMax
                                        Text item=RainTom
                                        Text item=RainProbTom
                                }
                        }
                }
                Frame {
                        Text label="Fische" icon="water" {
                                Text item=Clock
                                Switch item=fishtank
                                Switch item=fishtankcolors
                                Slider item=fishtankdimmer
                        }
                        Text label="Funksteckdosen" icon="poweroutlet" {
                                Text item=Clock
                                Switch item=tv_bedroom
                                Switch item=magnetboard
                        }
                }

                Frame {
                        Text label="Erdgeschoss" icon="groundfloor" {
                                Text item=Clock
                                Frame label="Flur" icon="corridor" {
                                        Switch item=magnetboard
                                }
                                Frame label="Wohnzimmer" icon="sofa" {
                                        Switch item=fishtank
                                        Switch item=fishtankcolors
                                        Slider item=fishtankdimmer
                                }
                        }
                        Text label="Obergeschoss" icon="firstfloor" {
                                Text item=Clock
                                Frame label="Schlafzimmer" icon="bedroom" {
                                        Switch item=tv_bedroom
                                }
                        }
                }
        }
}

My problem is, that a label of a frame is not shown when the frame is in another frame.
Is this a bug or is there another solution to show frame labels?
To test it you can remove the first frame and see that the label “Aktuelles” is shown, but the labels of the other frames are not shown.
Im running OH 2 with Basic UI.

Thanks for your help.

If you watch the openhab logs when your sitemap is loaded you will find that Frames within Frames are not supported.

It will render them but I don’t think it is fully functional.

Thanks for your answer, is there another solution to work with instead of frames?
I want my switches together wich schould be together and others in other groups.

I know of no other solution.