Today on the master channel, when reporting the version, the tool will look at the nearest ancestor tag and increment the m (number after the dash) https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/version.dart#L739.

We did this because the next release the commit would appear in would be a dev release. However, now that the dev channel has been deprecated, the next release the commit will appear in will be a beta release, which will increment the y.