Bug? Fade mark not working when Intensity is overwritten

I have two cue lists: one is setting the intensity of a moving head to zero in order to fade it in manually later on.

A second cue list uses a fade mark for slowly positioning of the moving heads in black but the intensity of this cue list is not used because it is overwritten by the first cue list which has a higher priority.

When all cue lists are released the second one starts, it is fading in black immediatly after starting it - which is correct.

But: When I first assert the first cue list for the intensities and I than start the second cue list, it is wating for the waiting time without moving the heads and starts then moving the heads in full speed.

I do not want that because it has to be silent on the stage while preparing for the next song.

Is it a bug?