server-config model carries both "system-property" and "system-properties" subresource

[localhost:9999 /] /host=local/server-config=server-one:read-resource(recursive=true)
{
"outcome" => "success",
"result" => {
"path" => undefined,
"system-property" => undefined,
"interface" => undefined,
"jvm" => {"default" => {
"type" => undefined,
"agent-lib" => undefined,
"agent-path" => undefined,
"debug-enabled" => undefined,
"debug-options" => undefined,
"env-classpath-ignored" => undefined,
"environment-variables" => undefined,
"heap-size" => undefined,
"max-heap-size" => undefined,
"java-agent" => undefined,
"java-home" => undefined,
"jvm-options" => undefined,
"permgen-size" => undefined,
"max-permgen-size" => undefined,
"stack-size" => undefined
}},
"socket-binding-group" => undefined,
"socket-binding-port-offset" => undefined,
"name" => "server-one",
"group" => "main-server-group",
"auto-start" => true,
"system-properties" => {
"test" =>

{ "value" => "value", "boot-time" => true }

,
"test2" =>

{ "value" => "value2", "boot-time" => true }

}
},
"compensating-operation" => undefined
}