At least in Xcode 26 beta 4 and 5, idevicesyslog is not working reliably. It sometimes streams the logs and sometimes doesn't.

idevicesyslog is used by Flutter to find the Dart VM url to connect to. However, Flutter also uses mDNS as a fallback for finding the Dart VM.

mDNS is also not reliable, however, especially on macOS 15 (#150131).

In addition, mDNS can't currently be used in Flutter's CI (#166843).

If both idevicesyslog and mDNS fail to find the Dart VM url, the Flutter CLI will hang