/weather command useless in worldtype "The Void"

If I make a world with the worldtype "The Void", the command "/weather rain" and "/weather thunder" is useless. The sky changes the color and no rain or thunder comes.
In other normal worlds (survival, ...) it works perfectly.

I have tested it with Shpax and Default resourcepack.

If you need more informations, you can ask me.

Sorry for my bad english ;(.