Once this plugin is installed, when a new issue is created and saved, the current Redmine (5.1.x) does not redirect to any page (leaving a "white page of death").... if you go and look at the issues (after this white screen of death) you can see that quite obviously the issue has been saved (with all of the correct checklist items).
The problem is that the current Redmine code does not protect against exceptions in the controller_issues_new_after_save hook. This means that the code following the call to the controller_issues_new_after_save hook does not get run, including a redirect.
The problem is that this plugin's implementation of the controller_issues_new_after_save hook attempts to save a stale ActiveRecord Issue object. See: ActiveRecord::StaleObjectError