We recently ran into an odd issue with redactor and multiple linebreaks. When more than one linebreak (Shift + Return) is entered, the content on the front end is randomly rendered as
As we were troubleshooting the issue the topic of Markdown came up and the thinking was that 2 or more linebreaks in a row was triggering Markdown to render a code block. I was getting ready to change the markdown parser when I noticed the _content_type setting. The issue was resolved once I set the _content_type to HTML, which wasn't an issue for us since all of the text fields had been set to redactors.
I'm not sure if we'd ever take the approach of having some mixed content types using Redactor and Markdown fields, but could there be a way where redactor fields are ignored by the Markdown parser & just output as straight html?