Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

extra empty line was rendered with // highlight-end at end of code blocks

Reproducible demo

No response

Steps to reproduce

try this markdown

```js
String foo = "bar"

// highlight-start
/...
这里可以写很多注释
甚至可以包含 // 行注释
或者 /** 块注释 */
// highlight-end
```

there will be an extra empty line at end of code blocks like this:

but if I set the end line in this style, the result is corrent:

```js
String foo = "bar"

// highlight-start
/...
这里可以写很多注释
甚至可以包含 // 行注释
// highlight-end
// highlight-next-line
或者 /** 块注释 */
```

Expected behavior

no extra line was rendered

Actual behavior

an extra line was rendered

Your environment

• Docusaurus version used: 3.7.0

Self-service

• I'd be willing to fix this bug myself.