The whole casing of the hub has been modified on the third generation with Made in Germany underlined (reason why the reinforcement rings for the gen 3 are also different), the seals are also different, all this explains that it doesn't leak anymore.

Yours like mine of 2012 are gen 2 that doesn't have the new casing+new seals. Mine of 2012 leaks also on the non drive side, the external gearbox is always wet and dirty, the one of 2016 never, it remains dry and clean.