Please see the attached test file.
Inside backticks everything is displayed literally in Markdown. Still, an opening bracket present there screws up the rest of the highlighting, in particular, the subsequent list items are not colored in blue in the test file.
Backslash-escaping the bracket fixes joe's highlighting, but breaks the file since it'll show up as a backspace in the rendered version.
Diff:
You might open this up at the author's repository.
Done: https://github.com/cmur2/joe-syntax/issues/36
I've included this fix in JOE github repo. But should I be taking anything else from https://github.com/cmur2/joe-syntax ?