Question regarding groups not switching smartplugs on


I created a group which currently contains:

1 Silvercrest LED Stripe
1 Silvercrest smartplug
1 Osram smartplug

When I change the brightness in Deconz for the group the Osram smartplug is switched on as soon as the brightness is different than 0 and also switches of when brighness is moved to 0. Anyway the Silvercrest smartplug just ignores all of this. Is this normal or is this anything which could be fixed so that also the Silvercrest smartplug does switch on brighness change?