Can't create or modify Columns block. I want to add a forth column to already existing or create 4 columns from very beginning. Even though in the back end and in the preview everything seems fine, the entire block dissapears from the front end.  the HTML is filled with empty divs: <div class="row"></div>. You can see this yourself on the following page: https://release.k8s.p4.greenpeace.org/canada/en/join-the-reuserevolution/

Andrada comment: seems very buggy and each time I try to make an edit, the entire block dissapears from the page. 

Requestor: