Fatal error when saving object with product-specific prices -> EntityMerger got object of wrong class

[BlackbitDevs]

We had a problem that some product objects could not be saved anymore. Fatal Error

request.CRITICAL: Uncaught PHP Exception Symfony\Component\ErrorHandler\Error\UndefinedMethodError: "Attempted to call an undefined method named "setOwner" of class "Doctrine\Common\Collections\ArrayCollection"." at [Pimcore-Root>/vendor/coreshop/core-shop/src/CoreShop/Bundle/ResourceBundle/Doctrine/ORM/EntityMerger.php line 153 {"exception":"[object] (Symfony\Component\Debug\Exception\FatalThrowableError(code: 0): Attempted to call an undefined method named "setOwner" of class "Doctrine\Common\Collections\ArrayCollection". at [Pimcore-Root>/vendor/coreshop/core-shop/src/CoreShop/Bundle/ResourceBundle/Doctrine/ORM/EntityMerger.php:153)"} []
was thrown.

CoreShop/src/CoreShop/Bundle/ResourceBundle/Doctrine/ORM/EntityMerger.php

Line 124 in ca1d813

$newData = $class->reflFields[$assoc['fieldName']]->getValue($entity);

caused $newCollection to be a Doctrine\Common\Collections\ArrayCollection afterwards.

This PR backports the change to EntityMerger class from 97f743a - now object can be saved as normal.

[dpfaffenbauer]

thanks