ICBF Fader Release

When I use a master list with fader as master and a second list with fader as ICBF crossfade I got a strange
issue. The master list is running but I moved the fader at zero for a blackout. Starting the second ICBF works also when I increase the fader. But when I decrease the fader suddenly the dimmer releases right away while all other attributes be faded out. This doesn't make any sense in my eyes. Why dimmers should be released while all other attributes be fading.
Is there a setting I have missed?
Got this on a RoadHog4 consoles and on Hog PC.