Currently, when the RequestPayloadValueResolver uses the Validator component, validation errors do not indicate which path the error refers to.

For example:

final readonly class TestDTO
{
    public function __construct(
        public string $name,
        public int $age,
        public bool $active,
    ) {
    }
}

{
    "name": "Name",
    "age": "23",
    "active": "false"
}

Current validation errors:

This value should be of type int.
This value should be of type bool.

These messages are difficult to understand because they do not indicate which field caused the violation.

However, when the Validator component is not available, the error messages are much clearer:

The type of the "age" attribute for class "App\DTO\TestDTO" must be one of "int" ("string" given).
The type of the "active" attribute for class "App\DTO\TestDTO" must be one of "bool" ("string" given).

I'm submitting this as a bug fix because the current validator-based messages are not very useful in practice.