Attention with Listutils when used on a list of lists

After hours of debugging I pinpointed the problem to the folowing:
If you use the Shuffle Block on a List of Lists then the Lists in the List are no longer Lists …(hmm thats a little confusing.)

So a list ((1 2), (a b)) when Shuffled becomes a list of two NON-lists…

and the result is:

last statement = FALSE!!!

you might want to post this also in the Appybuilder forum, so it can be fixed by @Hossein

@Taifun done