"Wrong behaviuor" with Switch element in sitemap for Dimmer item

Hello,

I want to have a “Switch” for my dimmer item in my sitemap. But right now I have the problem that the shown state of the light is not correct.
When I turn on the Switch element it shows in BasicUI and IOS-App the same:
ON = lightbulb icon yellow, button left and grey

normally it should be:
ON = lightbulb icon yellow, button left and green

My item:

Dimmer Badezimmer_Oben_Licht "Badezimmer Oben Licht" (gLight)    [ "Lighting" ] {channel="homematic:HM-LC-Dim1TPBU-FM:ccu2bridge:OEQ0367084:1#LEVEL"}

My sitemap:

        Switch item=Badezimmer_Oben_Licht label="Licht" icon="light"

Can I fix this somehow ?

regards,
salexes