zl stream only updating after the number of values is attained?

I am using the zl stream object to feed an oscillator bank. When opening the patch I send a list of initial values, all the same. When I start creating values, I would like that the oscbank list is updated from the moment the first value comes. However, it seems that it only starts updating after a full list is received a first time. From then on, the updates are going as they should. What should I do to get the updates from the start?