It looks to be related to the other bug. If you add:
xAxis: { max:50
},
yAxis: {min:0, max:50},
to your jsfiddle, it starts working.
Even adding:
yAxis: {max:30},
makes it plot the bubble.
The original bug I reported was fixed yesterday in github, so you could try out the new version from there if you want to. https://github.com/highslide-software/highcharts.com/tree/master/js