Issues no longer being closed by commit after update to 7.3.2

Issues can't be closed from commit comments, like 'closes #123 (closed)' or 'fixes #123 (closed)'. See also Github https://github.com/gitlabhq/gitlabhq/issues/8063

After a little research, the mentioning is now working again for me. In the omnibus install config (/opt/gitlab/embedded/service/gitlab-rails/config/config.yml) the default for the issue_closing_pattern is not commented, nor is there anything filled in. Commenting it doesn't seem to do anything for me, setting it to the value found in https://github.com/gitlabhq/gitlabhq/blob/master/config/initializers/1_settings.rb#L112 actually gets the mentioning working (idea from #5133). But not the automatic closing yet though..