only in patch2:
unchanged:
--- a/core/modules/outside_in/js/outside_in.js
+++ b/core/modules/outside_in/js/outside_in.js
@@ -133,7 +133,7 @@
       closeToolbarTrays();
 
       $editables = $('[data-drupal-outsidein="editable"]').once('outsidein');
-      if ($editables.length) {
+      if ($editables.length && document.querySelector('[data-offcanvas-main-canvas]')) {
         // Use event capture to prevent clicks on links.
         document.querySelector('[data-offcanvas-main-canvas]').addEventListener('click', preventClick, true);
 
only in patch2:
unchanged:
--- a/core/modules/outside_in/js/outside_in.js
+++ b/core/modules/outside_in/js/outside_in.js
@@ -124,6 +124,9 @@
    *  True enable edit mode, false disable edit mode.
    */
   function setEditModeState(editMode) {
+    if (!document.querySelector('[data-offcanvas-main-canvas]')) {
+      throw new Error('data-offcanvas-main-canvas is missing from outside-in-page-wrapper.html.twig');
+    }
     editMode = !!editMode;
     var $editButton = $(toggleEditSelector);
     var $editables;