How to get src for iframe in draft.js on reopen?

Question

Video

https://gist.github.com/paulinep/ac5a9bc63862835fe... here is a finished text editor component using draftjs One of the tasks was to insert a video link directly into the text for immediate video viewing. To do this, I use the iframe tag and specify the link as src. But after saving the material and re-opening it in the editor, when converting from HTML, the draft gives an error that it cannot get the key of this block in any way (although in fact it exists). In theory, all I need is to get src from it, because when you open it, because of this bug, you have to re-create the iframe entity. Has anyone experienced converting from html with iframe to contentState draftjs?