The next release in the Puppet 6 series, Puppet 6.21.1, is now available!
This release fixes a regression introduced in 6.21.0 where setting the `gid` parameter on a user resource with `forcelocal` was not idempotent.
For the full list of 6.21 changes, check out the release notes: https://puppet.com/docs/puppet/6.21/release_notes_osp.html