Include header doesn't work when placed right after title header

[monti-python]

What happened?

Adding an Include header right after a Title header doesn't work, e.g:

<!-- Title: Test -->
<!-- Include: macros.md -->

:children:

The only way to solve it to add an additional newline between both headers

What did you expect to happen?

The include statement above should work

How can we reproduce the behavior you experienced?

1. Create the following file macros.md

   
   <!-- Macro: :box:([^:]+):([^:]*):([^:][\s\S]*?):
   Template: ac:box
   Icon: true
   Name: ${1}
   Title: ${2}
   Body: ${3} -->

2. Create the following file `test.md`

:children:

3. Export your mark params env vars (`MARK_BASE_URL`, `MARK_SPACE`, `MARK_USERNAME`, `MARK_PASSWORD`)
4. Run `mark -f test.md --include-path "." --dry-run --debug`
5. You should get the below compiled HTML (wrong output):
```html
<p>:children:</p>

6. Now add a newline between the title and include headers in the previous file test.md:

   
   <!-- Title: Test -->

:children:

7. If you run step `4` again, now you get the right output:
```html
<p><ac:structured-macro ac:name="children"></ac:structured-macro></p>

Further Information (please complete the following information)

• Mark Version (mark --version): 9.12.0
• Mark Parameters: No additional params
• Confluence Hosting: Datacenter
• Confluence Version: N/A
• Environment specific Information: Ubuntu/WSL