There have been issues getting markdown support to work.

   issue 2551105 - Markdown2 emphasis intra-word
   issue 2551096 - Markdown autolink
   etc.

These all seem to fall back to a mismatch in the markdown supported by the
front end javascript library and one of the supported backend markdown libraries.

Consider rolling support for:

  https://github.com/markdown-it/markdown-it

on the front end and supporting
 
  https://github.com/executablebooks/markdown-it-py

for the back end.

These two libraries (different maintainers) seem to cover a lot of commonmark
including GFM and other (autolink) extensions. The python version
is an port of the markdown-it front end from js to python. Maybe this will
work to clean up the mismatches?