Redmine to GitLab migration: issue to commit references missed

I tried to move existing project from Redmine to GitLab CE v8.13.5, using redmine-gitlab-migrator.
It looks OK.
Reference in commit message to corresponding issue works as link.
But in issues I don’t see back reference links (“Mentioned in commit XXXX”).
Repository was migrated as described here.
I found a similar issue, but it looks not solved. How can I fix this problem? Can I run something (like rake task) to re-process commit messages?