[Document lists] Drag and dropping or pasting the table into the table cell with document list inside clears cell content
Part of #11377.
📝 Provide detailed reproduction steps (if any)
- Switch to
ck/10812-document-list-editing - Create table
- Create a few list items in one cell
- Try to paste or drag and drop another table as one list element
✔️ Expected result
The table is inserted as a document list element.
❌ Actual result
The whole content of the cell disappears and the table is not inserted:

📃 Other details
Browser: Chrome, Firefox
OS: Mac OS Monterey
First affected CKEditor version: 32.0.0
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The same thing happens without a document list:
https://user-images.githubusercontent.com/156149/162714810-4fad7264-6dd7-4666-9076-999d035ac369.mp4
This is confusing, though.
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