Steps to reproduce

Run the following app on macOS or iOS:

class IssueApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Center(
        child: CircularProgressIndicator.adaptive(
          value: 0.5,
        ),
      ),
    );
  }
}

Expected behavior

You expect to see a partially revealed Cupertino activity indicator.

Actual behavior

You see an indeterminate (continually animated) Cupertino activity indicator

Analysis

The adaptive progress indicator is coded to always use the default CupertinoActivityIndicator constructor, which is always indeterminate: