[Plugin: WP-Markdown] Linked Images

I’m seeing that when adding a link to an image, the auto-coded URLs are being re-formatted and removed. Here’s what I enter into the editor:

[![label-here][IMGREF](https://www.example.com/url/here.jpg)

  [IMGREF]: https://www.example.com/url/here.jpg

When I update the post, it is reformatted to:

[![label-here][2][2]

  []: https://www.example.com/url/here.jpg
  [2]: https://www.example.com/url/here.jpg

I found that even if I change the syntax for the image to be:

[![label-here][2][2]

…and remove the errant [] item, it re-adds it and breaks the image entirely.

https://www.ads-software.com/extend/plugins/wp-markdown/