TextSpan -> fontsize bug?

[BeanWei]

if the fontsize > 58, the text will disappear.

import 'package:flutter/material.dart';
import './plugin/rich_text.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: RealRichText([
            TextSpan(
              text: "😀",
              style: TextStyle(color: Colors.red, fontSize: 60),
            ),
          ]),
        ),
      ),
    );
  }
}

[BeanWei]

Refer the flutter issue