Extension doesn't recognize self-hosted GitLab using non-standard ports

I noticed that the extension stopped working a few months back and had expected #611 (closed) to fix this but with v3.55.0 installed I'm seeing the same behavior:

$ git remote show origin
* remote origin
  Fetch URL: ssh://git@git.example.org:7999/group/project.git

The output log shows this:

[info]: Extracted urls: []
[info]: Found 0 projects for urls: []
[info]: Extracted urls: [
          "ssh://git@git.example.org:7999/group/project.git"
        ]
[info]: Found 0 projects for urls: [
          "ssh://git@git.example.org:7999/group/project.git"
        ]