TYPO3 Core

I registered my own Validator for EXT:form in TYPO3 v 12.4:

prototypes:
  standard:
    validatorsDefinition:
      CustomDateValidation:
        implementationClassName: '\Lwo\Rebstock\Domain\Validation\DateValidation'

And did not know it was expected that the Class name ends on "Validator", it was therfore not found.

This gives a type error like

(1/1) TypeError
TYPO3\CMS\Form\Domain\Model\Renderable\AbstractRenderable::addValidator(): Argument #1 ($validator) must be of type TYPO3\CMS\Extbase\Validation\Validator\ValidatorInterface, null given, called in /var/www/html/vendor/typo3/cms-form/Classes/Domain/Model/Renderable/AbstractRenderable.php on line 201

Instead of a propper and excepted error that would be easier to debug.