What steps will reproduce the problem?
In flutter. Skia will render errors in rendering emojis which more than one Scalar. Like 1️⃣ (U+0031 U+FE0F U+20E3)

flutter related issues:
flutter/flutter#108720
flutter/flutter#49627
flutter/flutter#100964

What is the expected output? What do you see instead?
Render emoji nomarly.

What version of the product are you using? On what operating system?
I don't have more iPhone devices. I got two iPhones.
One is iPhone 6, iOS 12.4.8, and it renders OK.
Another is iPhone 12 Pro, iOS 16.2. and it renders an error.

Please submit a code sample via fiddle.skia.org showing the issue.

Flutter demo:

import 'package:flutter/material.dart';

void main() {
  runApp(const TextApp());
  // runApp(const RandomPositionTextApp());
}

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

  @override
  Widget build(BuildContext context) {
    TextStyle myCustomFontStyle = const TextStyle(
      fontFamily: 'NotoColorEmoji-Regular',
    );
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[

              Text(
                '1️⃣',
              ),
            ],
          ),
        ),
      ),
    );
  }
}

I tracked this bug. When using iPhone 6, iOS 12.4.8. It will fallback font 'Apple Color Emoji' And in iPhone 12 Pro, iOS 16.2 will fallback font '.LastResort' which will render '??' finally.

And I tried to fix this bug which the chromium project has similar issues:https://chromium.googlesource.com/chromium/src.git/+/7846480579c09efa317a65beb58c195a6a5bb352