Object support in class constants

Hi all, Somehow I missed that objects can be used in constants `const OBJ = new stdClass();` since PHP 8.1. As this is allowed for constants, I don't understand why this is not allowed for class constants.

    class Test {
        public const OBJ = new stdClass(); // Fatal error: New expressions are not supported in this context
    }

While this works:

    const OBJ = new stdClass();
    class Test {
        public const OBJ = OBJ; // works
    }

Is there are a reason for this limitation especially since "new" expression is valid for argument default values as well? Thanks, Marc