Confirmed, seeing this as well

This has been addressed already with this PR https://github.com/mantisbt/mantisbt/pull/1007

This one is really annoying, can't copy/paste code snippets anymore without having to manually replace " entities by actual quotes ...

This is not a bug in upstream, the bug is due to that Text processing process the text from the start:

1. Text processing converts & sign into entity name (ampersand[amp;]) within the code block or backtick
2. With that, we need to convert back the entity name back to its result within the specific function in the extension class.

And this is the PR https://github.com/mantisbt/mantisbt/pull/1007

@joel Which version of the MantisBT download do I use that has this fix?

@ajtruckle this is an open PR, so there is no version you can download at the moment.

Recent activity: https://github.com/mantisbt/mantisbt/pull/1332

This is still an issue on brand new installations of Mantis as of November 2021.

There's a plugin called Imatic Mantis Formatting that's supposed to fix the issue, but it's meant to replace the native Mantis formatting plugin, and it requires PHP 7.4 and Composer.

I was running PHP 7.1 so I wrote a simpler plugin that just run alongside the native one and patches the problem.

Here: OT Mantis Markdown Fixer. Hope that helps someone.