Code block with empty newline does not working

[mizunashi-mana]

Below text is not parsed correctly.

```
code block

included empty newline
```

Expect output:

<p><code>code block

included empty newline</code></p>

This code is valid with CommonMark: https://spec.commonmark.org/dingus/?text=%60%60%60%0Acode%20block%0A%0Aincluded%20empty%20newline%0A%60%60%60%0A

Actual output:

<p><code>`</code>
code block</p>
<p>included empty newline
<code>`</code></p>

[mizunashi-mana]

Oh... sorry, I misunderstood.
Traditional markdown is not CommonMark and Traditional markdown does not support Fenced Code Block.
Therefore, this is true act.

[cebe]

yeah, you need to use GithubMarkdown class for fenced code blocks.