diff -u b/core/modules/image/js/editors/image.js b/core/modules/image/js/editors/image.js
--- b/core/modules/image/js/editors/image.js
+++ b/core/modules/image/js/editors/image.js
@@ -22,12 +22,13 @@
       // Set our original value to our current HTML (for reverting).
       this.model.set('originalValue', $.trim(this.$el.html()));
       // $.val() callback function for copying input from our custom form to
-      // the Quickedit Field Form.
+      // the Quick Edit Field Form.
       this.model.set('currentValue', function (index, value) {
         var matches = $(this).attr('name').match(/(alt|title)]$/);
         if (matches) {
           var name = matches[1];
-          var $input = $('.quickedit-image-field-info input[name="' + name + '"]');
+          var $toolgroup = $('#' + options.fieldModel.toolbarView.getMainWysiwygToolgroupId());
+          var $input = $toolgroup.find('.quickedit-image-field-info input[name="' + name + '"]');
           if ($input.length) {
             return $input.val();
           }
@@ -262,7 +263,8 @@
      *   The current Field Model.
      */
     renderToolbar: function (fieldModel) {
-      var $toolbar = $('.quickedit-image-field-info');
+      var $toolgroup = $('#' + fieldModel.toolbarView.getMainWysiwygToolgroupId());
+      var $toolbar = $toolgroup.find('.quickedit-image-field-info');
       if ($toolbar.length === 0) {
         // Perform an AJAX request for extra image info (alt/title).
         var fieldID = fieldModel.get('fieldID');
@@ -270,7 +272,7 @@
         var self = this;
         self.ajax('GET', url, null, function (response) {
           $toolbar = $(self.template_toolbar(response));
-          $('#' + fieldModel.toolbarView.getMainWysiwygToolgroupId()).append($toolbar);
+          $toolgroup.append($toolbar);
           $toolbar.on('keyup paste', function () {
             fieldModel.set('state', 'changed');
           });
diff -u b/core/modules/image/src/Controller/QuickeditImageController.php b/core/modules/image/src/Controller/QuickeditImageController.php
--- b/core/modules/image/src/Controller/QuickeditImageController.php
+++ b/core/modules/image/src/Controller/QuickeditImageController.php
@@ -81,7 +81,7 @@
    *   The view mode of the field that is being rendered.
    *
    * @return \Symfony\Component\HttpFoundation\JsonResponse
-   *   The Ajax response.
+   *   The JSON response.
    */
   public function upload(EntityInterface $entity, $field_name, $langcode, $view_mode_id) {
     $field = $this->getField($entity, $field_name, $langcode);
diff -u b/core/modules/image/src/Plugin/InPlaceEditor/Image.php b/core/modules/image/src/Plugin/InPlaceEditor/Image.php
--- b/core/modules/image/src/Plugin/InPlaceEditor/Image.php
+++ b/core/modules/image/src/Plugin/InPlaceEditor/Image.php
@@ -21,11 +21,8 @@
     $field_definition = $items->getFieldDefinition();
 
     // This editor is only compatible with single-value image fields.
-    if ($field_definition->getFieldStorageDefinition()->getCardinality() == 1
-      && $field_definition->getType() == 'image') {
-      return TRUE;
-    }
-    return FALSE;
+    return $field_definition->getFieldStorageDefinition()->getCardinality() === 1
+      && $field_definition->getType() === 'image';
   }
 
   /**
only in patch2:
unchanged:
--- a/core/modules/image/image.install
+++ b/core/modules/image/image.install
@@ -61,3 +61,10 @@ function image_requirements($phase) {
 
   return $requirements;
 }
+
+/**
+ * Flush caches as we changed field formatter metadata.
+ */
+function image_update_8001() {
+  // Empty update to trigger a cache flush.
+}