diff --git a/modules/mod_breadcrumbs/tmpl/default.php b/modules/mod_breadcrumbs/tmpl/default.php
index 5cf0607150e6d..bc9a5715269f7 100644
--- a/modules/mod_breadcrumbs/tmpl/default.php
+++ b/modules/mod_breadcrumbs/tmpl/default.php
@@ -67,11 +67,12 @@
     </ol>
     <?php
 
-    // Structured data as JSON
+    // Structured data as JSON. The @id is derived from the current page URL because every page has its own
+    // breadcrumb trail; the module id is the same on every page the module is published on.
     $data = [
         '@context'        => 'https://schema.org',
         '@type'           => 'BreadcrumbList',
-        '@id'             => Uri::root() . '#/schema/BreadcrumbList/' . (int) $module->id,
+        '@id'             => Uri::getInstance()->toString() . '#breadcrumb',
         'itemListElement' => []
     ];
 
diff --git a/plugins/system/schemaorg/src/Extension/Schemaorg.php b/plugins/system/schemaorg/src/Extension/Schemaorg.php
index 8af09bb76109c..1009fc4bde05d 100644
--- a/plugins/system/schemaorg/src/Extension/Schemaorg.php
+++ b/plugins/system/schemaorg/src/Extension/Schemaorg.php
@@ -380,14 +380,16 @@ public function onBeforeCompileHead(BeforeCompileHeadApplicationEvent $event): v
 
         $baseSchema['@graph'][] = $webSiteSchema;
 
-        // Add WebPage
-        $webPageId = $domain . '#/schema/WebPage/base';
+        // Add WebPage. Unlike the Organization and WebSite nodes above, a WebPage is one node per page,
+        // so its @id is derived from the page URL rather than being a site-wide constant.
+        $webPageUrl = Uri::getInstance()->toString();
+        $webPageId  = $webPageUrl . '#webpage';
 
         $webPageSchema = [];
 
         $webPageSchema['@type']       = 'WebPage';
         $webPageSchema['@id']         = $webPageId;
-        $webPageSchema['url']         = htmlspecialchars(Uri::getInstance()->toString());
+        $webPageSchema['url']         = htmlspecialchars($webPageUrl);
         $webPageSchema['name']        = $app->getDocument()->getTitle();
         $webPageSchema['description'] = $app->getDocument()->getDescription();
         $webPageSchema['isPartOf']    = ['@id' => $webSiteId];