Standard mermaid syntax for flowchart links not rendered in GitLab

Summary

While using standard Mermaid syntax for dotted link, the displayed link is note rendered as dotted, but as a not-dotted default one.
While using standard syntax for ranking link, an error is produced at rendering, and no flowchart is displayed.

See documentation : https://mermaid-js.github.io/mermaid/diagrams-and-syntax-and-examples/flowchart.html

Steps to reproduce

Use examples cited below in a mermaid code block inside a markdown file and hit preview, or commit changes.

Example Project

See https://gitlab.com/youennmerel/mermaid_syntax_error for two example Markdown files

What is the current bug behavior?

While using standard Mermaid syntax for dotted link, the displayed link is not rendered as dotted, but as a not-dotted default one.

See documentation : https://mermaid-js.github.io/mermaid/diagrams-and-syntax-and-examples/flowchart.html#dotted-link

Code example :

flowchart LR;
   A-.->B;

Rendering :

flowchart LR;
   A-.->B;

While using standard syntax for ranking link, an error is produced at rendering, and no flowchart is displayed.

See documentation : https://mermaid-js.github.io/mermaid/diagrams-and-syntax-and-examples/flowchart.html#minimum-length-of-a-link

Example code :

graph TD
    A[Start] --> B{Is it?};
    B -->|Yes| C[OK];
    C --> D[Rethink];
    D --> B;
    B ---->|No| E[End];

Error message :

Encountered an error while rendering: Error: Parse error on line 6: ...D --&gt; B; B ----&gt;|No| E[End]; ----------------------^ Expecting &#39;SPACE&#39;, &#39;GRAPH&#39;, &#39;DIR&#39;, &#39;subgraph&#39;, &#39;end&#39;, &#39;AMP&#39;, &#39;TAGEND&#39;, &#39;START_LINK&#39;, &#39;STR&#39;, &#39;STYLE&#39;, &#39;LINKSTYLE&#39;, &#39;CLASSDEF&#39;, &#39;CLASS&#39;, &#39;CLICK&#39;, &#39;DOWN&#39;, &#39;UP&#39;, &#39;DEFAULT&#39;, &#39;NUM&#39;, &#39;COMMA&#39;, &#39;ALPHA&#39;, &#39;COLON&#39;, &#39;MINUS&#39;, &#39;BRKT&#39;, &#39;DOT&#39;, &#39;PCT&#39;, &#39;TAGSTART&#39;, &#39;PUNCTUATION&#39;, &#39;UNICODE_TEXT&#39;, &#39;PLUS&#39;, &#39;EQUALS&#39;, &#39;MULT&#39;, &#39;UNDERSCORE&#39;, got &#39;PIPE&#39;

What is the expected correct behavior?

Flowchart is displayed in GitLab as expected by Mermaid language specification

Output of checks

This bug happens on GitLab.com

Edited Oct 30, 2020 by Youenn