Code formatting doesn't work for yaml

[TimoGlastra]

When using codeblocks for yaml somehow all lines get squished into one, making it unusable. It works if you don't specify a language but that removes the nice syntax highlighting. I haven't encountered this with other languages.

Example:

Sidenotes content:

  #! Usage

  ```yml
  actions:
    - id: something
      uses: something/something@v1
      something: else
```

This is not just the case with sidenotes, also if you place it in the content.md file.

Any idea why this is just happening with yaml?