Editor crashes after undoing multi-block paste

[Mgsy]

Is this a bug report or feature request? (choose one)

🐞 Bug report

💻 Version of CKEditor

11.0.1

📋 Steps to reproduce

1. Copy some content from two blocks.
2. Put the caret at the end of the first line of some multi-line block.
3. Paste.
4. Undo.

✅ Expected result

The editor doesn't crash.

❎ Actual result

The editor crashes.

📃 Other details that might be useful

Error

position.js:913 Uncaught TypeError: Cannot read property 'root' of null
    at Function.createFromPosition (position.js:913)
    at new Ur (range.js:34)
    at Zr._getTransformedByMove (range.js:695)
    at Zr._getTransformedByMoveOperation (range.js:506)
    at Zr.getTransformedByOperation (range.js:409)
    at Zr.<anonymous> (liverange.js:131)
    at zl.listenTo (liverange.js:119)
    at zl.fire (emittermixin.js:196)
    at zl.(anonymous function) [as applyOperation] (http://192.168.1.250:8081/build/docs/ckeditor5/latest/snippets/build-classic-source/snippet.js:4:48856)
    at Rh._undo (basecommand.js:161)

GIF

It doesn't crash if we paste the content at the end of the block.

[Reinmar]

This is serious. Adding to the current milestone.