save to db data-gjs-droppable

Infact if i save my template all data-gjs-droppable is missing and in a next render it doens load data-gjs-droppable attributes and son on.

I save in this way:

     editor.Commands.add
        ('save-db',
        {
            run: function(editor, sender)
            {

              //var html = editor.runCommand('gjs-get-inlined-html');
              var html = editor.getHtml();
             var css = editor.getCss();

              var customBlocks = $($.parseHTML(html)).find('.custom-block');
              var post_ids = [];
              var params =  {css:css,html: html,post_id:<?php echo $_post->ID ?>};

              jQuery.ajax(
                        {url: '<?php echo $pathHttpGrapes ?>/scripts/save.php',
                        type: 'POST',
                        data: params,
                        dataType: "json",
                        crossDomain: false,
                        success: function(result){
                        },
                        error:function(){
                            toastr.error("Si è generato un errore inatteso");
                        }
               });
              sender && sender.set('active'); // turn off the button
                         }
        });

thanks in advance.
regards.