Subcomponent of component doesnt receive http data on form post. Bug or Feature?

I switched to Nette 3 from Nette 2.4.

I have this structure

Presenter
--- Component A (in createComponentA1 is set componentA1->setSomething($this->something), componentA has persistent parameter something)
------ Component A1
--------- Form

The case is a send Form (POST). But the problem is that the Component A never received persistent parameter, is it bug or this change is purpouse?