850gx2 on 6.21.1: clearing log not possible anymore?

Hi all,

 /system logging action> set numbers=0 memory-lines=1
 /system logging action> set numbers=0 memory-lines=500

Above should clear the memory log: 0 * name=“memory” target=memory memory-lines=500 memory-stop-on-full=no

Can anyone confirm this is no longer working fom them?