#### Prevent indentation drift in list-item code blocks (#19647, #19990 by @Austin1serb, @giaBaoJS)

<!-- prettier-ignore -->
```markdown
<!-- Input -->
- [x] short first line.

      second paragraph at six spaces that wraps
      onto another line here.

<!-- Prettier stable -->
- [x] short first line.

      second paragraph at six spaces that wraps
          onto another line here.

<!-- Prettier main -->
- [x] short first line.

      second paragraph at six spaces that wraps
      onto another line here.
```