When I run flutter doctor -v, the following logs appear
⣽Unhandled exception:
Bad state: Future already completed
#0 _AsyncCompleter.complete (dart:async/future_impl.dart:43:31)
#1 _NativeSocket.startConnect.<anonymous closure>.connectNext.<anonymous closure> (dart:io-patch/socket_patch.dart:682:23)
#2 _NativeSocket.issueWriteEvent.issue (dart:io-patch/socket_patch.dart:1102:14)
#3 _NativeSocket.issueWriteEvent (dart:io-patch/socket_patch.dart:1109:12)
#4 _NativeSocket.multiplex (dart:io-patch/socket_patch.dart:1130:11)
#5 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
I tried searching and understood why here #40515 & 70596.
That's because the flutter is blocked by AdGuard (here).
But I wonder if it is possible that the flutter works well without having to disable AdGuard (maybe adding Flutter to whitelist by AdGuard?)
Thanks for all suggestions!