diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
index 22a5d41b5f88b..b52794aed840f 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php
@@ -119,6 +119,13 @@ public function reverseTransform(mixed $value): ?\DateTime
         }
 
         if (0 != intl_get_error_code()) {
+            var_dump($value);
+            var_dump($this->dateFormat);
+            var_dump($this->timeFormat);
+            var_dump($this->calendar);
+            var_dump($this->pattern);
+            var_dump(\Locale::getDefault());
+
             throw new TransformationFailedException(intl_get_error_message(), intl_get_error_code());
         } elseif ($timestamp > 253402214400) {
             // This timestamp represents UTC midnight of 9999-12-31 to prevent 5+ digit years
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
index 29cacc24223cc..52810d3071f18 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/DateTypeTest.php
@@ -15,6 +15,7 @@
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Intl\Intl;
 use Symfony\Component\Intl\Util\IntlTestHelper;
 use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
 
@@ -92,7 +93,7 @@ public function testSubmitFromSingleTextDateTimeWithCustomFormat()
     public function testSubmitFromSingleTextDateTime()
     {
         // we test against "de_DE", so we need the full implementation
-        IntlTestHelper::requireFullIntl($this, false);
+        IntlTestHelper::requireFullIntl($this, false, true);
 
         \Locale::setDefault('de_DE');
 
@@ -106,6 +107,18 @@ public function testSubmitFromSingleTextDateTime()
         ]);
 
         $form->submit('2.6.2010');
+        var_dump(__METHOD__);
+        var_dump(Intl::getIcuVersion());
+
+        if (!$form->isValid()) {
+            /** @var FormError $error */
+            foreach ($form->getErrors(true) as $error) {
+                var_dump($error->getMessage());
+                var_dump($error->getCause()->getMessage());
+                var_dump($error->getCause()->getInvalidMessage());
+                var_dump($error->getCause()->getInvalidMessageParameters());
+            }
+        }
 
         $this->assertEquals(new \DateTime('2010-06-02 UTC'), $form->getData());
         $this->assertEquals('02.06.2010', $form->getViewData());
diff --git a/src/Symfony/Component/Intl/Util/IntlTestHelper.php b/src/Symfony/Component/Intl/Util/IntlTestHelper.php
index d22f2e6953e3f..2d454265cbfdd 100644
--- a/src/Symfony/Component/Intl/Util/IntlTestHelper.php
+++ b/src/Symfony/Component/Intl/Util/IntlTestHelper.php
@@ -32,9 +32,16 @@ class IntlTestHelper
      *
      * @return void
      */
-    public static function requireIntl(TestCase $testCase, string $minimumIcuVersion = null)
+    public static function requireIntl(TestCase $testCase, string $minimumIcuVersion = null, bool $debug = false)
     {
+        if ($debug) {
+            var_dump(__METHOD__);
+            var_dump($minimumIcuVersion);
+        }
         $minimumIcuVersion ??= Intl::getIcuStubVersion();
+        if ($debug) {
+            var_dump($minimumIcuVersion);
+        }
 
         // We only run tests if the version is *one specific version*.
         // This condition is satisfied if
@@ -66,14 +73,18 @@ public static function requireIntl(TestCase $testCase, string $minimumIcuVersion
      *
      * @return void
      */
-    public static function requireFullIntl(TestCase $testCase, string $minimumIcuVersion = null)
+    public static function requireFullIntl(TestCase $testCase, string $minimumIcuVersion = null, bool $debug = false)
     {
+        if ($debug) {
+            var_dump(__METHOD__);
+            var_dump($minimumIcuVersion);
+        }
         // We only run tests if the intl extension is loaded...
         if (!Intl::isExtensionLoaded()) {
             $testCase->markTestSkipped('Extension intl is required.');
         }
 
-        self::requireIntl($testCase, $minimumIcuVersion);
+        self::requireIntl($testCase, $minimumIcuVersion, $debug);
 
         // Consequently, tests will
         //