Editor crashes when pasting across document title and body

[oleq]

📝 Provide detailed reproduction steps (if any)

0. Copy some paragraph from the guide.
1. Open title feature guide
2. Type "foo" in the title and "bar" in the body
3. Select [foo bar].
4. Paste

✔️ Expected result

Content is pasted.

❌ Actual result

Error is thrown and the editor stops working

CKEditorError: model-position-path-incorrect: The position's path is incorrect. Read more: https://ckeditor.com/docs/ckeditor5/latest/framework/guides/support/error-codes.html#error-model-position-path-incorrect
 {"position":{"root":"main","path":[0,0,0],"stickiness":"toNext"}}

📃 Other details

• master,
• cross-browser

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[pomek]

Source of the issue: #1921 (or more precise: #4506).

[oleq]

A good catch. Closing as a dup of #1921.