diff -u b/src/Tests/DiffAdminFormsTest.php b/src/Tests/DiffAdminFormsTest.php
--- b/src/Tests/DiffAdminFormsTest.php
+++ b/src/Tests/DiffAdminFormsTest.php
@@ -123,6 +123,12 @@
     $this->assertFieldByName('fields[node.body][settings_edit_form][settings][markdown]', 'filter_xss_all');
     $this->drupalPostAjaxForm(NULL, [], 'node.title_settings_edit');
     $this->assertFieldByName('fields[node.title][settings_edit_form][settings][markdown]', 'filter_xss_all');
+
+    $edit = [
+      'fields[node.sticky][plugin][type]' => 'hidden',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $this->assertFieldByName('fields[node.sticky][plugin][type]', 'hidden');
   }
 
   /**