Nested tables generate improper markdown

[niegowski]

📝 Provide detailed reproduction steps (if any)

1. http://fake.ckeditor.com:8081/build/docs/ckeditor5/latest/features/markdown.html
2. clone the table 
3. select the cloned table (including some text around the table)
4. drop/paste it into another table cell

✔️ Expected result

Proper table MD

❌ Actual result

MD is scrambled

📃 Other details

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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[AnnaTomanek]

We already have a section called "Known issues" in the guide that explains cases like this. For previous features that were unsupported, we stripped the content from the data:

This means that advanced formatting like list styles, table styles or page break markers will be stripped in the effecting data. These are not supported by Markdown and therefore cannot be converted from HTML to Markdown.

The question is what should happen in this case.

[ctwhome]

I was surprised to see that tables are rendered perfectly if they are written in markdown from the source code like in your own example, But if the table is generated from the live editor, it saves it as an HTML table:
https://ckeditor.com/ckeditor-5/demo/markdown/