prosemirror: creating code block with textblockTypeInputRule throws an error

Issue details

After creating a code block with textblockTypeInputRule an error is thrown.

Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The new child element contains the parent.

Steps to reproduce

• go to the example editor on https://prosemirror.net/
• type three backticks (```)
• a code block will be created
• type any character
• an error will be thrown

ProseMirror version

latest

Affected platforms

• Chrome
• Firefox
• Internet Explorer
• Other