Dynamic Content WYSIWYG not showing on 4.2.0 or 4.2.1

Has anyone else been able to get the dynamic content block to show the wysiwyg ?

I am having such strange behaviour with this

These are the error logs showing in the console:

I have done some more testing here and it seems that this breaks after running the whitelabel plugin provided by nickian. No idea if this is related at all, however opened an issue in his GitHub here.

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