To reproduce:
Start Random Song Mix
Play any XML-based internet source: internet radio station, MP3tunes album, etc.

The RandomPlay plugin looks for the following events to indicate it should stop random mode:

	%stopcommands = (
		'clear'	     => 1,
		'loadtracks' => 1, # multiple play
		'playtracks' => 1, # single play
		'load'       => 1, # old style url load (no play)
		'play'       => 1, # old style url play
		'loadalbum'  => 1, # old style multi-item load
		'playalbum'  => 1, # old style multi-item play
	);

The problem here is that if you do $client->execute( [ 'playlist', 'play', $url ] ); this is not sent as a notification because the isQuery flag is not set for this request.  So RandomPlay never sees this and keeps on going in random mode.

Not sure of the right way to solve this.

CC Fred as he may have some idea why this is not considered a query, or why only query methods get sent as notifications.