Bug: Incorrect blank line formatting for nested Markdown lists inside JSDoc

[astrochemx]

Bug Description

There is a discrepancy in how prettier-plugin-jsdoc formats nested Markdown lists compared to native Prettier.

When formatting a JSDoc block containing a loose Markdown list with nested items, the plugin improperly injects blank lines before the nested items and simultaneously strips the intended blank lines between the top-level list items.

Native Prettier formats the raw markdown version of this correctly, but prettier-plugin-jsdoc breaks the spacing rules.

Input

/**
 * Spaced Repetition
 *
 * - If Correct (Quality >= 3):
 *   - If repetitions == 0: interval = 1.
 *   - If repetitions == 1: interval = 6.
 *
 * - If Incorrect (Quality < 3):
 *   - repetitions = 0.
 *   - interval = 1.
 */

Expected Behavior (Matches Native Prettier)

The blank line separating the top-level list items should be preserved, and no extra blank lines should be forcefully injected before the nested children:

/**
 * Spaced Repetition
 *
 * - If Correct (Quality >= 3):
 *   - If repetitions == 0: interval = 1.
 *   - If repetitions == 1: interval = 6.
 *
 * - If Incorrect (Quality < 3):
 *   - repetitions = 0.
 *   - interval = 1.
 */

Actual Behavior

The plugin removes the blank line before - If Incorrect and forcefully injects blank lines before the nested items:

/**
 * Spaced Repetition
 *
 * - If Correct (Quality >= 3):
 *
 *   - If repetitions == 0: interval = 1.
 *   - If repetitions == 1: interval = 6.
 * - If Incorrect (Quality < 3):
 *
 *   - repetitions = 0.
 *   - interval = 1.
 */

Steps to Reproduce

1. Create a JavaScript/TypeScript file with the provided input JSDoc comment.
2. Run Prettier against the file with prettier-plugin-jsdoc enabled.
3. Observe that the nested list spacing is incorrectly mangled.

Environment

• Prettier Version: 3.8.3
• prettier-plugin-jsdoc Version: 1.8.0
• Node.js Version: 26.1.0
• OS: Windows 11 x64