diff -u b/src/Tests/ComplexWidgetWebTest.php b/src/Tests/ComplexWidgetWebTest.php
--- b/src/Tests/ComplexWidgetWebTest.php
+++ b/src/Tests/ComplexWidgetWebTest.php
@@ -434,42 +434,6 @@
    */
   public function testReferencingExistingEntitiesNoSubmit() {
     // Allow addition of existing nodes.
-    $this->setAllowExisting(TRUE);
-    $title = $this->randomMachineName();
-
-    $this->drupalCreateNode([
-      'type' => 'ief_reference_type',
-      'title' => $title,
-      'first_name' => $this->randomMachineName(),
-      'last_name' => $this->randomMachineName(),
-    ]);
-    $node = $this->drupalGetNodeByTitle($title);
-    $this->assertTrue($node, 'Created ief_reference_type node "' . $node->label() . '"');;
-
-    $this->drupalGet($this->formContentAddUrl);
-    $this->drupalPostAjaxForm(NULL, [], $this->getButtonName('//input[@type="submit" and @value="Add existing node" and @data-drupal-selector="edit-multi-actions-ief-add-existing"]'));
-    $this->assertResponse(200, 'Opening inline form for existing entity was successful.');
-
-    $parent_title = $this->randomMachineName();
-    $edit = [
-      'multi[form][entity_id]' => $node->getTitle() . ' (' . $node->id() . ')',
-      'title[0][value]' => $parent_title,
-    ];
-
-    // Create ief_test_complex node.
-    $this->assertFieldByName('multi[form][entity_id]', NULL, 'Existing entity reference autocomplete field found.');
-    $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertResponse(200, 'Submission of parent entity was successful.');
-    $this->assertNoText(t("This value should not be null."), "The error message 'This value cannot be null' was not found in the page.");
-    $node = $this->drupalGetNodeByTitle($parent_title);
-    $this->assertTrue($node, 'Created ief_reference_type node.');
-  }
-
-  /**
-   * Tests if referencing an existing entity works without submitting the form.
-   */
-  public function testReferencingExistingEntitiesNoSubmit() {
-    // Allow addition of existing nodes.
     $this->updateSetting('allow_existing', TRUE);
     $title = $this->randomMachineName();