Nested Gesture Does not change on Tap

You can add Color to the last AnimatedPositioned which use text widget.item.locationName in your code, like:

AnimatedPositioned(
  curve: Curves.ease,
  duration: Duration(milliseconds: 400),
  bottom: moveWidget
    ? 10
    : MediaQuery.of(context).size.height * 0.20,
  left: 10.0,
  right: 0.0,
  top: moveWidget
    ? 15
    : MediaQuery.of(context).size.height * 0.70,
  child: Container(
    color: Colors.white,
    Text(
      '${widget.item.locationName}',
      style: TextStyle(fontSize: 30, color: Colors.white),
    ),
  ),
),

You will see a white screen (the widget which blocking you) when you scroll up. You can fix it by 2 ways

1. Change the bottom 10 to a larger number

2. Move this part of AnimatedPositioned to Top of the Stack widget

The Nested Gesture should work probably as you expected.