GitLab truncates references to Jira-Issues

When using references to issues in Jira in a Merge Requests, GitLab truncates them; e.g. using "T1ABC123-1" the generated link is truncated to T1"ABC123-1" ("T1" is then not part of the link); clicking on it tries to open the issue "ABC123-1" instead of "T1ABC123-1".