Bug report

Hi ✋,

I have a Symfony project with https://github.com/KnpLabs/DoctrineBehaviors.
I tried to update project to PHP8 but I'm having problem with phpstan.

Bundle created its own extensions https://github.com/KnpLabs/DoctrineBehaviors/tree/master/utils/phpstan-behaviors/src/Type

No problem with PHP7.4 but with PHP8:

After investigations, problem occurs only when method __toString is defined.
Problem appears on invoke here https://github.com/KnpLabs/DoctrineBehaviors/blob/master/utils/phpstan-behaviors/src/Type/TranslationTypeHelper.php#L36

Code snippet that reproduces the problem

https://github.com/RomulusED69/phpstan-knp-doctrine-behaviors-bug

Thanks for your help