If you paste a listitem that doesn't have a parent list into the editor you can get into an invalid state that throws errors if you try to add more list items. For example, if a page has the html;

<ul>
  <li>test</li>
  <li>test</li>
  <li>test</li>
</ul>
hello world
<li>test</li>

and you copy that page's content and paste into the editor things break.

Of course the original html is invalid, but I would expect graceful handling of this as can not make guarantees about external content.

Lexical version: 0.8.0

Steps To Reproduce

1. Create a page with invalid html (codepen) and copy the rendered content
2. Go to the lexical playground and paste the content. Note that the last list item's parent is a paragraph, not a list.
3. Put cursor at the end of foo and hit enter.

The current behavior

No new list item is inserted and an error is thrown;

Uncaught Error: Minified Lexical error #39; visit https://lexical.dev/docs/error?code=39 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
    at qy (main.bd972200.js:21:233277)
    at nv.insertAfter (main.bd972200.js:21:236788)
    at nv.insertNewAfter (main.bd972200.js:21:237313)
    at pf.insertParagraph (main.bd972200.js:21:166539)
    at Array.<anonymous> (main.bd972200.js:21:260975)
    at Vf (main.bd972200.js:21:180784)
    at Rm.dispatchCommand (main.bd972200.js:21:208977)
    at Array.<anonymous> (main.bd972200.js:21:264129)
    at Vf (main.bd972200.js:21:180784)
    at main.bd972200.js:21:180583

The expected behavior

A new list item to be inserted. More generally, I imagine the pasted list item should have had a list inserted automatically as it's parent.

After experimenting with other tools some (namely Apple's Notes app) just drops the list item and treats it as a paragraph, which would also be acceptable. The important thing is that don't end up in an invalid state.