Issue with ruler after <h3>

Given this sample Markdown file:

https://gist.githubusercontent.com/thdoan/07518c0eec8804390d0938a647766f2e/raw/e50b354206d8bc71894762ce1bb5150879d610cf/sample.md

![image](https://user-images.githubusercontent.com/4110567/217113479-38cf8ca1-9bda-4a32-93ad-01a5d568c6e1.png)

```
<p>---</p>
```