Can only edit source of MJML once in GrapeJS editor

I’m using the new MJML editor in Mautic an encounter several issues with it. One is that i can only edit MJML source code once. After closing the editor and get back into it, the mail-template cannot be edited in source again. Simply nothing happens when i click on the pencil-symbol.

Hi, there is a bug right now.
Just save the email, reload the page and will work again.