How to store collection object data in doctrine2 custom type?

Question

Doctrine ORM

In general, there is an entity, it contains a collection object with a custom type. The problem is that when updating, convertToDatabaseValue does not work. As I understand it, the doctrine does not understand that the collection object has changed.

class Record
    {
    ...
        /**
         * @ORM\Column(type="ContentContext_RecordTranslationCollection")
         * @var RecordTranslationCollection
         */
        private $translations;
    
    ...
        public function __construct   ( )
        {
            $this->translations = new RecordTranslationCollection();
        }
    ....
        /**
         * @param RecordTranslation $translation
         */
        public function addTranslation(RecordTranslation $translation): void
        {
            /** @var RecordTranslation $translation */
            foreach ($this->translations as $currentTranslation) {
                if ($currentTranslation->getLocale() === $translation->getLocale()) {
                    $this->translations->removeElement($currentTranslation);
                    break;
                }
            }
            $this->translations->add($translation);
        }
    }

public function convertToDatabaseValue($collection, AbstractPlatform $platform)
    {
        // при апдейте, сюда не попадаем
    }


    public function convertToPHPValue($json, AbstractPlatform $platform)
    {
        $data = json_decode($json, true) ?? [];
        $collection = new RecordTranslationCollection();
        foreach ($data as $translate) {
            $collection->add($this->hydrator->hydrate($translate, RecordTranslation::class));
        }
        return $collection;
    }

If you somehow pervert with clone, then everything works. Any thoughts on how to resolve this?