There is a very fine line between the appbar and the sticky header.

[DavidZXY]

[meodta]

Same Issue here, is there any chance that this will be solved anytime soon?

[slightfoot]

This is a floating point rounding error mixed with anti-aliasing. This is a platform issue. You can force the height of your AppBar or body to be an integer division of the devicePixelRatio will resolve this.

https://api.flutter.dev/flutter/widgets/MediaQueryData/devicePixelRatio.html