Xcode 8 UIScrollView stuck when scroll to bottom

[onmyway133]

• UIScrollView is inside UIController, which is inside UIScrollView (has 3 pages)
• Content view of UIScrollView is used because of AutoLayout. UIScrollView contentSize.height > UIScrollView frame.height

[onmyway133]

     constrain(scrollView, scrollViewContentView, pageIndicator) {
       scrollView, scrollViewContentView, pageIndicator in

       pageIndicator.left == pageIndicator.superview!.left
       pageIndicator.right == pageIndicator.superview!.right
       pageIndicator.bottom == pageIndicator.superview!.bottom
       pageIndicator.height == 40

       scrollView.top == scrollView.superview!.top
       scrollView.left == scrollView.superview!.left
       scrollView.right == scrollView.superview!.right
       scrollView.bottom == pageIndicator.top

       scrollViewContentView.edges == scrollViewContentView.superview!.edges

       //scrollViewContentView.top == scrollView.superview!.top // no need
      // scrollViewContentView.bottom == scrollViewContentView.superview!.bottom
     }