Sencha CMD 3.0.0.230 - buildPaths not taken into account?

[snam]

Hi!

I'm using this configuration in my app.json:
"buildPaths": {
"testing": "build/testing",
"production": "build/production",
"package": "build/phonegap/www",
"native": "build/native"
},

And yet, the result of doing a "sencha app build package" goes into "build/MyApp/package".

Is that a known bug, or am I doing sth wrong?
Or should I update to the latest release?

Thanks