OAuth code which was working for two years suddenly throws "No address associated with hostname" going through socket_patch.dart

[MrCsabaToth]

I'm not sure if this is an SDK problem or package problem. My Flutter application uses OAuth with Strava, SUUNTO, Under Armor, and Training Peaks APIs. This worked OK the last couple of years. Recently I upgraded to Channel beta, 3.13.0-0.1.pre and since then I receive this error (No address associated with hostname), however I'm 100% sure the host names and fine.

I haven't had time to isolate a small code because I'm dealing other fallout related to various dependencies. (Kinda old code https://github.com/TrackMyIndoorWorkout/TrackMyIndoorWorkout/blob/develop/lib/upload/training_peaks/oauth.dart derived from the discontinued https://pub.dev/packages/strava_flutter 2+ years ago).

I wonder if anyone else ran into this.