Prettier currently uses remark-parse@8 to parse Markdown/MDX. remark-parse@9 was released on Oct 14, 2020, switching it over to micromark: remarkjs/remark#536

Upgrading Prettier to remark-parse@9 (or newer) would fix the following reported bugs with Markdown parsing, and possibly others:

• Markdown: Link text converted to lower-case #3835
• Paragraph starting with a decimal number is moved into preceding list (MDX) #11332

This is a non-trivial task because micromark uses a completely different plugin API, so all of Prettier's Markdown plugins will need to be updated or replaced.