Doesn't work for standalone .mmd files

[guwidoe]

Expected behaviour

sequenceDiagram
  A-->B: Works!

Loading

Actual behaviour

Even though I'm trying to preview a standalone mermaid (.mmd) file, the preview expects the ```mermaid fence and won't render a preview without it.

I'm using the dark theme for VSCode and didn't change the theme settings of the extension.

The command appears to be called "Preview Mermaid"

not "Preview Mermaid Diagram" like mentioned in the documentation of this extension.