Issue #3079595 by jhodgdon: The Help breadcrumb builder does not set cache contexts

core/modules/help_topics/src/HelpBreadcrumbBuilder.php

@@ -43,6 +43,7 @@ class HelpBreadcrumbBuilder implements BreadcrumbBuilderInterface {
    */
   public function build(RouteMatchInterface $route_match) {
     $breadcrumb = new Breadcrumb();
+    $breadcrumb->addCacheContexts(['url.path.parent']);
     $breadcrumb->addLink(Link::createFromRoute($this->t('Home'), '<front>'));
     $breadcrumb->addLink(Link::createFromRoute($this->t('Administration'), 'system.admin'));
     $breadcrumb->addLink(Link::createFromRoute($this->t('Help'), 'help.main'));

core/modules/help_topics/tests/src/Functional/HelpTopicTest.php

@@ -66,6 +66,7 @@ class HelpTopicTest extends BrowserTestBase {
       'access administration pages',
       'view the administration theme',
       'administer permissions',
+      'administer site configuration',
     ]);
     $this->anyUser = $this->createUser([]);
   }
@@ -235,12 +236,21 @@ class HelpTopicTest extends BrowserTestBase {
     // Verify Help Topics administration breadcrumbs.
     $trail = [
         '' => 'Home',
-        'admin' => t('Administration'),
-        'admin/help' => t('Help'),
+        'admin' => 'Administration',
+        'admin/help' => 'Help',
       ];
     $this->assertBreadcrumb('admin/help/topic/help_topics_test.test', $trail);
     // Ensure we are on the expected help topic page.
     $this->assertSession()->pageTextContains('Also there should be a related topic link below to the Help module topic page and the linked topic.');
+
+    // Verify that another page does not have the help breadcrumb.
+    $trail = [
+      '' => 'Home',
+      'admin' => 'Administration',
+      'admin/config' => 'Configuration',
+      'admin/config/system' => 'System',
+      ];
+    $this->assertBreadcrumb('admin/config/system/site-information', $trail);
   }
 
 }