HarmonyOS Flutter url_launcher Plugin无法调起系统浏览器，报："Unable to establish connection on channel."

Flutter url_launcher Plugin无法调起系统浏览器。

Flutter代码实现：

static void launchURL(String url) async {
  if (await canLaunchUrl(Uri.parse(url))) {
    await launchUrl(Uri.parse(url));
  } else {
    throw 'Could not launch $url';
  }
}
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