This deprecation period is being renewed after we found it affected many IDE plugins that had not yet migrated, but did not receive a warning during the deprecation period.
We also expected to have a migration guide since the migration is not always to simply rename to addPubRootDirectories. This will give another 1+ year for the migration to be completed.

Part of https://github.com/flutter/flutter/issues/139243
Will update announcement at flutter-announce to reflect this API will remain for a while longer.