what you can do is add a click event to your ckeditor and assign below method and check what element class draggable=true is getting added. (Ck ediotr adds this attribute in dom)

restrictEvent() {

document.querySelectorAll(".parent-element-class 
 .element-class").forEach(element => {
  element.addEventListener("dragstart", (event) => {
    event.preventDefault();
    event.stopPropagation();
    console.log("drag started");
  });
});

}