Error after getting data with code block in list

[LukaszGudel]

📝 Provide detailed reproduction steps (if any)

1. Switch to ck/10812-document-list-editing.
2. Open documentlist manual test.
3. Select "Second" word and turn it into code block.
4. Call editor.getData()

or

3. Select a single line list item.
4. Change it to code block.
5. Add something after the code block in the same bullet point.
6. Call editor.getData().

✔️ Expected result

Editor data is returned.

❌ Actual result

Error on editor.getData() in the console:

emittermixin.js:233 Uncaught TypeError: Cannot read properties of undefined (reading 'name')
    at Mapper.getModelLength (mapper.js:531:1)
    at Mapper.findPositionIn (mapper.js:595:1)
    at Mapper.on.priority (mapper.js:129:1)
    at Mapper.fire (emittermixin.js:200:1)
    at Mapper.toViewPosition (mapper.js:380:1)
    at DowncastDispatcher.<anonymous> (converters.js:403:1)
    at DowncastDispatcher.fire (emittermixin.js:200:1)
    at DowncastDispatcher._testAndFire (downcastdispatcher.js:549:1)
    at DowncastDispatcher._convertInsert (downcastdispatcher.js:295:1)
    at DowncastDispatcher.convert (downcastdispatcher.js:203:1)

[Reinmar]

On our newest branches (the one for list props) it works fine. I'll keep the ticket open for some time to verify later that we didn't break it again.

[Reinmar]

It's still fixed on latest master.