нажми F12

console

или crtl + shift + c

там твой принты будут тоже выходить

console вкладка

а network?

обнови страницу

в консоли без изменений, те. ничего

flutter run свой_девайс -v

flutter run -d chrome -v
[ +127 ms] executing: [C:\src\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +62 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] a2bde82fbd52e09057a4146f46889f4e10342d32
[        ] executing: [C:\src\flutter/] git tag --contains HEAD
[ +220 ms] Exit code 0 from: git tag --contains HEAD
[   +1 ms] 1.20.0-7.2.pre
[   +8 ms] executing: [C:\src\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +39 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/beta
[        ] executing: [C:\src\flutter/] git ls-remote --get-url origin
[  +35 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[  +74 ms] executing: [C:\src\flutter/] git rev-parse --abbrev-ref HEAD
[  +35 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] beta
[  +81 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.  
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +5 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.      
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.    
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.    
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.    
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.    
[  +23 ms] executing: C:\Users\Vladimir\AppData\Local\Android\sdk\platform-tools\adb.exe devices -l
[  +75 ms] List of devices attached
[  +10 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.        
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.  
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.      
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.    
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +219 ms] Generating E:\Flutter\Web\web_app\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +117 ms] Launching lib\main.dart on Chrome in debug mode...
[  +66 ms] Updating assets
[ +102 ms] Syncing files to device Chrome...
[  +66 ms] Generating E:\Flutter\Web\web_app\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[  +67 ms] <- reset
[   +8 ms] C:\src\flutter\bin\cache\dart-sdk\bin\dart.exe --disable-dart-dev C:\src\flutter\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root
C:\src\flutter\bin\cache\flutter_web_sdk/ --incremental --target=dartdevc --debugger-module-names -Ddart.developer.causal_async_stacks=true --output-dill

C:\Users\Vladimir\AppData\Local\Temp\flutter_tools.4f2a4f3a\flutter_tool.3b0c36ea\app.dill --libraries-spec file:///C:/src/flutter/bin/cache/flutter_web_sdk/libraries.json      
--packages .packages -Ddart.vm.profile=false -Ddart.vm.product=false
--bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoid-closure-call-instructions --enable-asserts
--track-widget-creation --filesystem-root C:\Users\Vladimir\AppData\Local\Temp\flutter_tools.4f2a4f3a\flutter_tools.76c1b22c --filesystem-scheme org-dartlang-app
--initialize-from-dill build\cache.dill.track.dill --platform file:///C:/src/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill
[  +19 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+9207 ms] Syncing files to device Chrome... (completed in 9 360ms, longer than expected)
[   +1 ms] Synced 23.0MB.
[   +1 ms] <- accept
[  +14 ms] Caching compiled dill
[ +294 ms] [CHROME]:
[   +5 ms] [CHROME]:DevTools listening on ws://127.0.0.1:55460/devtools/browser/2ea7dd58-252e-4837-8bf4-ee9f1b34d6e7

вроде норм, попробуй другие девайсы

На edge тоже самое