Problem with Phasers

I am trying to learn how to work with the phasers.

As far everything works fine. I follow the instructions in the manual step by step and it works like it is supposed to.

But:

It just works this way as long as I select a FULL group of fixtures, means “all of a kind”.

As soon I select just a selection of fixtures, for example “Mac 4 to 8” out of 12, I am not able to activate the phase-function.
I can make them move, but I cannot use the Phase-Button.
I tryed it with different groups of fixtures, different fixture types.

Am I doing something wrong? Does anybody have this behavior as well?

I figured it out...

do not create Groups out of other groups!

If you choose fixtures directly, using the command line it works perfectly, if you choose a group, preaviosly combined out of other groups, it doesnt!