Call to a member function __toString() on string on custom type

[NickOver]

Bug Report

Q	A
Version	2.12.0

Summary

When using custom types, from some reason, when i use custom type as ID, its generate error.

Current behavior

Currently, its generate error Handling "App\Returns\Application\Command\CompleteReturnCommand" failed: Call to a member function __toString() on string

Expected behavior

I can read and update entities without modify convertToDatabaseValue method

How to reproduce

I have entity:

class CustomerReturn
{
    public function __construct(
        private ReturnId $id,
        private OrderId $returningOrderId,
    ) {}
}

With mapping:

<entity name="App\Returns\Domain\CustomerReturn" table="customer_return" >
        <id name="id" type="ReturnId" column="id" />
        <field name="returningOrderId" type="OrderId" column="returning_order_id" length="80" />
</entity>

Types:

class OrderIdType extends Type
{
    public function getSQLDeclaration(array $column, AbstractPlatform $platform): string
    {
        return 'VARCHAR(36)';
    }

    public function convertToPHPValue($value, AbstractPlatform $platform): OrderId
    {
        return new OrderId($value);
    }

    public function convertToDatabaseValue($value, AbstractPlatform $platform): string
    {
        return $value->__toString();
    }
}

class ReturnIdType extends Type
{
    public function getSQLDeclaration(array $column, AbstractPlatform $platform): string
    {
        return 'VARCHAR(36)';
    }

    public function convertToPHPValue($value, AbstractPlatform $platform): ReturnId
    {
        return new ReturnId($value);
    }

    public function convertToDatabaseValue($value, AbstractPlatform $platform): string
    {
        return $value->__toString();
    }
}

Objects:

class OrderId
{
    public function __construct(
        private string $id,
    ) {}

    public static function fromString(string $id): OrderId
    {
        return new OrderId($id);
    }

    public function getId(): string
    {
        return $this->id;
    }

    public function __toString(): string
    {
        return $this->id;
    }
}

class ReturnId
{
    public function __construct(
        private string $id,
    ) {}

    public static function fromString(string $id): ReturnId
    {
        return new ReturnId($id);
    }

    public function getId(): string
    {
        return $this->id;
    }

    public function __toString(): string
    {
        return $this->id;
    }
}

From unknown reason, i got error mentioned above. When i replace method in ReturnIdType to:

    public function convertToDatabaseValue($value, AbstractPlatform $platform): string
    {
        if (is_string($value))
            return $value;
        return $value->__toString();
    }

Everything works fine.
Only difference is one type i use as id field, and second as "normal" field.