diff --git a/typo3/sysext/extbase/Classes/Mvc/Controller/Argument.php b/typo3/sysext/extbase/Classes/Mvc/Controller/Argument.php
index c0c88d183820..cea4bc081cb4 100644
--- a/typo3/sysext/extbase/Classes/Mvc/Controller/Argument.php
+++ b/typo3/sysext/extbase/Classes/Mvc/Controller/Argument.php
@@ -273,6 +273,7 @@ public function setValue($rawValue)
             }
         }
         $this->validationResults->merge($this->propertyMapper->getMessages());
+        $this->propertyMapper->resetMessages();
         return $this;
     }
 
diff --git a/typo3/sysext/extbase/Classes/Property/PropertyMapper.php b/typo3/sysext/extbase/Classes/Property/PropertyMapper.php
index c83b52254817..1cc653e925da 100644
--- a/typo3/sysext/extbase/Classes/Property/PropertyMapper.php
+++ b/typo3/sysext/extbase/Classes/Property/PropertyMapper.php
@@ -91,6 +91,7 @@ public function injectConfigurationBuilder(PropertyMappingConfigurationBuilder $
      */
     public function initializeObject()
     {
+        $this->resetMessages();
         foreach ($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['extbase']['typeConverters'] as $typeConverterClassName) {
             $typeConverter = $this->objectManager->get($typeConverterClassName);
             foreach ($typeConverter->getSupportedSourceTypes() as $supportedSourceType) {
@@ -117,7 +118,6 @@ public function convert($source, $targetType, PropertyMappingConfigurationInterf
             $configuration = $this->configurationBuilder->build();
         }
         $currentPropertyPath = [];
-        $this->messages = new Result();
         try {
             $result = $this->doMapping($source, $targetType, $configuration, $currentPropertyPath);
             if ($result instanceof Error) {
@@ -133,7 +133,7 @@ public function convert($source, $targetType, PropertyMappingConfigurationInterf
     }
 
     /**
-     * Get the messages of the last Property Mapping
+     * Get the messages of the last Property Mapping.
      *
      * @return \TYPO3\CMS\Extbase\Error\Result
      */
@@ -142,6 +142,14 @@ public function getMessages()
         return $this->messages;
     }
 
+    /**
+     * Resets the messages of the last Property Mapping.
+     */
+    public function resetMessages(): void
+    {
+        $this->messages = new Result();
+    }
+
     /**
      * Internal function which actually does the property mapping.
      *
diff --git a/typo3/sysext/extbase/Tests/Functional/Property/TypeConverter/DateTimeConverterTest.php b/typo3/sysext/extbase/Tests/Functional/Property/TypeConverter/DateTimeConverterTest.php
index d0e0acdaf8e6..347551e17ce0 100644
--- a/typo3/sysext/extbase/Tests/Functional/Property/TypeConverter/DateTimeConverterTest.php
+++ b/typo3/sysext/extbase/Tests/Functional/Property/TypeConverter/DateTimeConverterTest.php
@@ -31,14 +31,14 @@ class DateTimeConverterTest extends FunctionalTestCase
     public function convertFromReturnsAnErrorWhenConvertingIntegersToDateTime()
     {
         $propertyMapper = $this->getContainer()->get(PropertyMapper::class);
-
         $dateTime = $propertyMapper->convert(0, \DateTime::class);
 
         self::assertNull($dateTime);
-        self::assertTrue($propertyMapper->getMessages()->hasErrors());
+        $messages = $propertyMapper->getMessages();
+        self::assertTrue($messages->hasErrors());
         self::assertSame(
             'The date "%s" was not recognized (for format "%s").',
-            $propertyMapper->getMessages()->getFirstError()->getMessage()
+            $messages->getFirstError()->getMessage()
         );
     }
 
@@ -304,10 +304,11 @@ public function convertFromReturnsErrorIfSourceIsAnArrayAndEitherDayMonthOrYearA
         );
 
         self::assertNull($dateTime);
-        self::assertTrue($propertyMapper->getMessages()->hasErrors());
+        $messages = $propertyMapper->getMessages();
+        self::assertTrue($messages->hasErrors());
         self::assertSame(
             'Could not convert the given date parts into a DateTime object because one or more parts were 0.',
-            $propertyMapper->getMessages()->getFirstError()->getMessage()
+            $messages->getFirstError()->getMessage()
         );
     }
 
diff --git a/typo3/sysext/form/Classes/Mvc/ProcessingRule.php b/typo3/sysext/form/Classes/Mvc/ProcessingRule.php
index cb339bcd60cf..b623c11c79c0 100644
--- a/typo3/sysext/form/Classes/Mvc/ProcessingRule.php
+++ b/typo3/sysext/form/Classes/Mvc/ProcessingRule.php
@@ -168,6 +168,7 @@ public function process($value)
         if ($this->dataType !== null) {
             $value = $this->propertyMapper->convert($value, $this->dataType, $this->propertyMappingConfiguration);
             $messages = $this->propertyMapper->getMessages();
+            $this->propertyMapper->resetMessages();
         } else {
             $messages = GeneralUtility::makeInstance(ObjectManager::class)
                 ->get(Result::class);