macOS Finder Preview Pane not rendering Markdown

Finder Preview Pane (Sidebar) won't render Markdown—only shows "Information/Metadata" list.

Message:

I’m having a nightmare of a time with the macOS Finder Preview Pane (the right-side panel, NOT the Spacebar Quick Look).

The Problem: Even with QLMarkdown or Peek installed and enabled in System Settings > Extensions, the Finder Preview Pane refuses to render the Markdown content. Instead, it only shows the file icon and a list of metadata (Tags, Dates, Information).

When I go to View > Show Preview Options, the window is titled "Preview Options - Text" and it is missing the "Show Preview" checkbox entirely. It seems macOS is hard-locking .md files into a "Text" category that only allows for metadata display in the sidebar.

What I’ve already tried (none of this worked):

• Installed and enabled QLMarkdown and Peek in Extensions.
• Spacebar Quick Look works perfectly and renders the MD, but the sidebar panel does not.
• Changed "Open With" to the preview apps and clicked "Change All."
• Ran qlmanage -r, qlmanage -r cache, and killed quicklookd / Finder.
• Resized the preview pane (made it very wide).
• Deleted the Finder plist and restarted.

Goal: I want to keep Sublime Text as my default editor for .md files but actually see the rendered content in the Finder sidebar.

Has anyone found a way ?