Operation description is not complete in :read-resource-description

[domain@localhost:9990 /] /profile=default:read-resource-description(operations=true)
{
    "outcome" => "success",
    "result" => {
        "description" => "A named set of subsystem configurations.",
        ...
        "operations" => {
            ...
            "read-attribute-group-names" => {
                "operation-name" => "read-attribute-group-names",
                "description" => "Gets the names of all the attribute groups under the selected resource",
                "request-properties" => {},
                "reply-properties" => {
                    "type" => LIST,
                    "value-type" => STRING
                }
            },
            ...
}
[domain@localhost:9990 /] /profile=default:read-operation-description(name=read-attribute-group-names)
{
    "outcome" => "success",
    "result" => {
        "operation-name" => "read-attribute-group-names",
        "description" => "Gets the names of all the attribute groups under the selected resource",
        "request-properties" => {},
        "reply-properties" => {
            "type" => LIST,
            "value-type" => STRING
        },
        "read-only" => true,
        "runtime-only" => true
    }
}