mermaid markdown for dotted lines not working (rendered as solid lines)

Summary

The following mermaid markdown is not rendering dotted lines arrow lines (or regular lines) on GitLab.com.

graph TD;
  A -.-> B;
  C -.- D;

Steps to reproduce

Here is the rendered diagram on GitLab.com (it incorrectly draws a solid arrow from node A to node B, and solid line from C to D):

graph TD;
  A -.-> B;
  C -.- D;

What is the expected correct behavior?

Here is the expected results from the Mermaid Live Editor (Powered by mermaid 8.0.0) as of Apr 23, 2019. https://mermaidjs.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoiZ3JhcGggVEQ7XG4gIEEgLS4tPiBCO1xuICBDIC0uLSBEOyIsIm1lcm1haWQiOnsidGhlbWUiOiJkZWZhdWx0In19