Failed to execute 'appendChild' on 'Node' when undo at version 9.3.0 and above

[AzkabanPresident]

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Description

drag first block and drag second connected to first，then drag second to above first and connect it. call undo.
catch DOMException: Failed to execute 'appendChild' on 'Node': The new child element contains the parent.
9.3.0 and above is exist this bug

Reproduction steps

1. drag first block
2. drag second block connected to first
3. then drag second to above first and connect it.
4. call undo.

Stack trace

No response

Screenshots

No response

Browsers

Chrome desktop, Safari desktop, Android mobile, iOS mobile

[BeksOmega]

This looks like a dupe of #7002 So I'm going to go ahead and close =) If it's not feel free to reopen!