Describe the bug
In the presenter, when a slide ends with a code block such as
```html
<!-- slide vertical=true -->
then the content of the next slide is incorporated in the current one starting with a line "[CROSSNOTESLIDE]"
**Environment**
- OS: Windows 10
- VSCode: 1.85.2
- Markdown Preview Enhanced: 0.8.11
**To Reproduce**
Using [markdown.md](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/files/14067789/markdown.md), in VS code, open the "Markdown Preview Enhanced: Open Preview to the Side". The preview displays the fault. See attached image.
![Markdown](https://github.com/shd101wyy/vscode-markdown-preview-enhanced/assets/12171263/854441b3-0594-4638-8f74-fb1d349a6fb7)
Describe the bug In the presenter, when a slide ends with a code block such as