Showcase in ReorderableListView show at incorrect position

[cirediew]

Describe the bug
When you use a Showcase widget in a ReorderableListView the cutout and tooltip are rendered at the wrong position.

To Reproduce
My code:

ReorderableListView(
          scrollController: scrollController,
          onReorder: (oldIndex, newIndex) async {
            await onReorder(oldIndex, newIndex, sortOrder, account, repo);
          },
          children: [
            Showcase(
                key: myKey,
                overlayColor: Colors.red,
                child: Text('abcdefg'),
                description: 'this is it')
          ]
);

I did some digging myself and by adding ancestor to every localToGlobal in: get_position.dart, like so:
box.localToGlobal(const Offset(0.0, 0.0), ancestor: box)
will solve the issue for widgets in a ReorderableListView. But doing so creates the same issue for widgets not in a ReorderableListView. So I'm not entirely sure if this is a issue with the lib or with flutter.

Edit:
As you can see the red overlay also doesn't overlay the app bar and bottom bar, as it should be doing.