diff -u b/core/modules/inline_form_errors/src/FormErrorHandler.php b/core/modules/inline_form_errors/src/FormErrorHandler.php
--- b/core/modules/inline_form_errors/src/FormErrorHandler.php
+++ b/core/modules/inline_form_errors/src/FormErrorHandler.php
@@ -53,8 +53,8 @@
    *   The current state of the form.
    */
   protected function displayErrorMessages(array $form, FormStateInterface $form_state) {
-    // Use the original error display for Quick Edit forms, because they are
-    // already inline.
+    // Use the original error display for Quick Edit forms, because in this case
+    // the errors are already near the form element.
     if ($form['#form_id'] == 'quickedit_field_form') {
       parent::displayErrorMessages($form, $form_state);
       return;
only in patch2:
unchanged:
--- a/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
+++ b/core/modules/inline_form_errors/tests/src/Unit/FormErrorHandlerTest.php
@@ -50,6 +50,7 @@ public function testDisplayErrorMessagesInline() {
 
     $form = [
       '#parents' => [],
+      '#form_id' => 'test_form',
     ];
     $form['test1'] = [
       '#type' => 'textfield',
@@ -114,6 +115,7 @@ public function testSetElementErrorsFromFormState() {
 
     $form = [
       '#parents' => [],
+      '#form_id' => 'test_form',
     ];
     $form['test'] = [
       '#type' => 'textfield',
@@ -127,4 +129,34 @@ public function testSetElementErrorsFromFormState() {
     $this->assertSame('invalid', $form['test']['#errors']);
   }
 
+  /**
+   * Test that Quick Edit forms show non-inline errors.
+   *
+   * @covers ::handleFormErrors
+   * @covers ::displayErrorMessages
+   */
+  public function testDisplayErrorMessagesNotInlineQuickEdit() {
+    $form_error_handler = $this->getMockBuilder(FormErrorHandler::class)
+      ->setConstructorArgs([$this->getStringTranslationStub(), $this->getMock(LinkGeneratorInterface::class), $this->getMock(RendererInterface::class)])
+      ->setMethods(['drupalSetMessage'])
+      ->getMock();
+
+    $form_error_handler->expects($this->at(0))
+      ->method('drupalSetMessage')
+      ->with('invalid', 'error');
+
+    $form = [
+      '#parents' => [],
+      '#form_id' => 'quickedit_field_form',
+    ];
+    $form['test'] = [
+      '#type' => 'textfield',
+      '#title' => 'Test',
+      '#parents' => ['test'],
+      '#id' => 'edit-test',
+    ];
+    $form_state = new FormState();
+    $form_state->setErrorByName('test', 'invalid');
+    $form_error_handler->handleFormErrors($form, $form_state);
+  }
 }