Ask Jason Blevins:

https://jblevins.org/projects/markdown-mode/

The answer, as provided by Gemini based on this article, is: It doesn’t. And that disqualifies it from real world use to me, sadly.

I see, thanks. I reset Org mode state as well on file open, so I never noticed (it never bothered me) that Markdown state is not stored.

Have a peaceful Sabbath.