Lines started with # in code block being recognized as markdown title

[IsaacXen]

Description

When using markdown syntax, lines started with # in code block unexpectedly get recognized as markdown titles.

This affect the most when writing bash script snippet in markdown:

# Creating Directory

One can use `mkdir` to create a directory:

```bash
# This create a new directory call `foo` in current directory
mkdir foo
```

The above text snippet contains two lines that start with #:

• Line 1: a markdown title.
• Line 6: a bash comment in a code block.

The latter one is not a markdown title, but unexpectedly be recognized as one, as visualize in the following screenshot (highlighted with red arrow):

To Reproduce

1. Create a new document.

2. Set syntax style to Markdown.

3. Paste the following text:

   ```
   # This should not be tread as a title
   ## Same with two `#`
   ### or more
    # Adding a space before it won't
   ```
   

4. See error in outline.

Expected behavior

Lines started with # in code block should not be recognized as markdown title.

CotEditor version

4.5.5 (569)

macOS version

macOS Version 12.6.5 (Build 21G531)

Additional context

No response