Hi @Yoda-Man, I just deployed the flutter counter app to firebase hosting, and the asset I added to the app loads just fine.
See the screenshot below. I tested on Safari/Chrome/Firefox/Arc, all browsers display the asset just fine.

What version of flutter did you upgrade from?
What server is your app hosted on?
Do you have this issue with an app created on the latest version of flutter?
What renderer are you using to deploy your app?
Is this on mobile browsers or desktop browsers?

Please also add any additional information that you think might be relevant.

In the future, when filing an issue, please provide as much information about the issue as you can to make the issues actionable.

Thank you

code sample

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Image.asset('assets/images/Dash.png'),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

flutter doctor -v

[✓] Flutter (Channel stable, 3.10.3, on macOS 13.4 22F66 darwin-arm64, locale en-GB)
    • Flutter version 3.10.3 on channel stable at /Users/nexus/dev/sdks/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f92f44110e (5 days ago), 2023-06-01 18:17:33 -0500
    • Engine revision 2a3401c9bb
    • Dart version 3.0.3
    • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/nexus/Library/Android/sdk
    • Platform android-33, build-tools 33.0.0
    • Java binary at: /Users/nexus/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/222.4459.24.2221.9971841/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3)
    • Xcode at /Applications/Xcode-14.3.0.app/Contents/Developer
    • Build 14E222b
    • CocoaPods version 1.12.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Users/nexus/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/222.4459.24.2221.9971841/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] IntelliJ IDEA Ultimate Edition (version 2023.1.2)
    • IntelliJ at /Users/nexus/Applications/JetBrains Toolbox/IntelliJ IDEA Ultimate.app
    • Flutter plugin version 74.0.4
    • Dart plugin version 231.9065

[✓] IntelliJ IDEA Ultimate Edition (version 2023.1.2)
    • IntelliJ at /Users/nexus/Library/Application Support/JetBrains/Toolbox/apps/IDEA-U/ch-0/231.9011.34/IntelliJ IDEA.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.78.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.66.0

[✓] Connected device (4 available)
    • Pixel 7 (mobile) • adb-28291FDH2001SA-5Lv71w._adb-tls-connect._tcp. • android-arm64  • Android 13 (API 33)
    • Nexus (mobile)   • 00008020-001875E83A38002E                        • ios            • iOS 16.5 20F66
    • macOS (desktop)  • macos                                            • darwin-arm64   • macOS 13.4 22F66 darwin-arm64
    • Chrome (web)     • chrome                                           • web-javascript • Google Chrome 114.0.5735.106

[✓] Network resources
    • All expected network resources are available.

• No issues found!

Unable to load assets in flutter web: Flutter Web engine failed to fetch "assets/AssetManifest.smcbin" #128230

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Unable to load assets in flutter web: `Flutter Web engine failed to fetch "assets/AssetManifest.smcbin"` #128230