SliverVisibiltyDetector reports a SliverPersistentHeader as not visible when pinned

[Fgico]

Problem description

package: visibility_detector,
version: 0.4.0+2
SliverVisibiltyDetector reports a SliverPersistentHeader as not visible when its pinned at the topo of the CustomScrollView

Steps to reproduce

CustomScrollView(
slivers: [
SliverVisibilityDetector(
key: uniqueKey,
onVisibilityChanged: (visInfo) {
// visInfo.visibleFraction is 0 when header is pinned
},
sliver: SliverPersistentHeader(
delegate:
mySliverPersistentHeaderDelegate( ),
pinned: true,
),
),
//after persistentHeader
SliverList(),
],
),

A setup like this seems to make the problem reappaer on a different project

Expected behavior

I expect it to still be considered as visible since its stuck at the top of the ScrollView

Actual behavior

It doesnt detect the Sliver visible

Environment

Windows 10, Flutter 3.13.3

[GreenAsJade]

I wonder if this is what is making VisibilityDetector fail to recognise that widgets are underneath a pinned header?