diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 6a19942a29..92782406ca 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -284,10 +284,6 @@ config_entity:
     uuid:
       type: uuid
       label: 'UUID'
-      constraints:
-        Length:
-          max: 128
-          maxMessage: 'UUID: may not be longer than 128 characters.'
     langcode:
       type: string
       label: 'Language code'
diff --git a/core/lib/Drupal/Core/Config/StorableConfigBase.php b/core/lib/Drupal/Core/Config/StorableConfigBase.php
index a2752290ea..bc81ab7cc1 100644
--- a/core/lib/Drupal/Core/Config/StorableConfigBase.php
+++ b/core/lib/Drupal/Core/Config/StorableConfigBase.php
@@ -129,7 +129,7 @@ public function getStorage() {
    *
    * @return \Drupal\Core\Config\Schema\Element
    */
-  public function getSchemaWrapper() {
+  protected function getSchemaWrapper() {
     if (!isset($this->schemaWrapper)) {
       $this->schemaWrapper = $this->typedConfigManager->createFromNameAndData($this->name, $this->data);
     }
diff --git a/core/modules/rest/src/Plugin/rest/resource/ConfigEntityResource.php b/core/modules/rest/src/Plugin/rest/resource/ConfigEntityResource.php
index d4b98c342f..91d4e89b21 100644
--- a/core/modules/rest/src/Plugin/rest/resource/ConfigEntityResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/ConfigEntityResource.php
@@ -13,12 +13,10 @@ class ConfigEntityResource extends EntityResource {
    * {@inheritdoc}
    */
   protected function validate(EntityInterface $entity) {
-    /** @var \Drupal\Core\Config\Entity\ConfigEntityInterface $entity */
-    $config = \Drupal::configFactory()->getEditable($entity->getConfigDependencyName());
-    $config->setData($entity->toArray());
-
-    $typed_config = $config->getSchemaWrapper();
-
+    // Use typed config to validate the validate the config entity.
+    /** @var \Drupal\Core\Config\TypedConfigManagerInterface $type_config_manager */
+    $type_config_manager = \Drupal::service('config.typed');
+    $typed_config = $type_config_manager->createFromNameAndData($entity->getConfigDependencyName(), $entity->toArray());
     $violations = $typed_config->validate();
 
     $this->processViolations($violations);
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 6e9436e63b..5b22991e9a 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -759,7 +759,7 @@ public function testPost() {
         $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nuuid.0.value: UUID: may not be longer than 128 characters.\n", $response);
       }
       else {
-        $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nuuid: UUID: may not be longer than 128 characters.\n", $response);
+        $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nuuid: This is not a valid UUID.\n", $response);
       }
     }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index 57ef94dc0c..e2e02e1dc8 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -172,12 +172,6 @@ public function testSchemaMapping() {
     $expected['mapping']['name']['type'] = 'string';
     $expected['mapping']['uuid']['type'] = 'uuid';
     $expected['mapping']['uuid']['label'] = 'UUID';
-    $expected['mapping']['uuid']['constraints'] = [
-      'Length' => [
-        'max' => 128,
-        'maxMessage' => 'UUID: may not be longer than 128 characters.',
-      ],
-    ];
     $expected['mapping']['langcode']['type'] = 'string';
     $expected['mapping']['langcode']['label'] = 'Language code';
     $expected['mapping']['status']['type'] = 'boolean';