Draggable bottom sheet repro

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const BottomSheetApp());

class BottomSheetApp extends StatelessWidget {
  const BottomSheetApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Bottom Sheet Sample')),
        body: const BottomSheetExample(),
      ),
    );
  }
}

class BottomSheetExample extends StatelessWidget {
  const BottomSheetExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        child: const Text('showModalBottomSheet'),
        onPressed: () => showModalBottomSheet(
          context: context,
          isScrollControlled: true,
          isDismissible: true,
          shape: const RoundedRectangleBorder(
            borderRadius: BorderRadius.vertical(top: Radius.circular(15)),
          ),
          builder: (context) => DraggableScrollableSheet(
            initialChildSize: 0.4,
            minChildSize: 0.2,
            maxChildSize: 0.9,
            expand: false,
            builder: (context, scrollController) => SafeArea(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Container(
                    height: 50,
                    color: Colors.red,
                    child: const Center(
                      child: Text('This cannot be dragged up'),
                    ),
                  ),
                  Expanded(
                    child: ListView.builder(
                      controller: scrollController,
                      itemCount: 100,
                      itemBuilder: (context, index) => ListTile(
                        title: Text('This can be dragged $index'),
                        onTap: () => Navigator.of(context).pop(index),
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}