Currently, the new editor officially supports only specific/ limited markdown codes, as per Keyboard Shortcuts, Markdown, and Autocomplete - Markdown.
In some cases, when trying to use the complete list of markdown codes (e.g. https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet), it won't present the expected results .
Examples of unsupported markdown (tables):
Implement full markdown code support
No know workaround for some specific markdown codes other than manually creating the elements on the editor.