stop-context/stop waittime ignored

[standalone@localhost:9990 /] /subsystem=modcluster/:read-operation-description(name=stop
{
    "outcome" => "success",
    "result" => {
        "operation-name" => "stop",
        "description" => "Tell reverse proxies that all contexts on the node can't process requests.",
        "request-properties" => {"waittime" => {
            "type" => INT,
            "description" => "Timeout to wait for all contexts to stop.",
            "expressions-allowed" => false,
            "required" => false,
            "nillable" => true,
            "default" => 10,
            "unit" => "SECONDS"
        }},
        "reply-properties" => {},
        "read-only" => false,
        "runtime-only" => true
    }
}

17:17:26,725 DEBUG [io.undertow] (default task-21) UT005057: Sending MCMP response to destination: /192.168.122.196:59778, HTTP status: 200, Headers: {X-Powered-By=[Undertow/1], Server=[JBoss-EAP/7], Content-Type=[text/plain; charset=ISO-8859-1]}, response: Type=STOP-APP-RSP,JvmRoute=jboss-eap-7.1-2Alias=default-host,localhostContext=/clusterbenchRequests=0