.../src/Normalizer/EntityReferenceFieldItemNormalizer.php            | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php b/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
index ea2e020..c0a83b7 100644
--- a/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
+++ b/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
@@ -51,8 +51,9 @@ public function normalize($field_item, $format = NULL, array $context = []) {
       // Add a 'url' value if there is a reference and a canonical URL. Hard
       // code 'canonical' here as config entities override the default $rel
       // parameter value to 'edit-form.
-      if ($url = $entity->url('canonical')) {
-        $values['url'] = $url;
+      if ($entity->hasLinkTemplate('canonical') && $url = $entity->toUrl('canonical')->toString(TRUE)) {
+        $this->addCacheableDependency($context, $url);
+        $values['url'] = $url->getGeneratedUrl();
       }
     }
     return $values;