Flutter 1.22.6 has been released to stable. This is a hotfix release on the 1.22 branch and also includes a hotfixed Dart 2.10.5 version. Changes for this build are listed below and are available on the Flutter Wiki here: Hotfixes to the Stable Channel.
This fixes the following issues:
https://github.com/flutter/flutter/issues/70895 - Build error when switching between dev/beta and stable branches.
Patrick, on behalf of the Flutter & Dart teams.