Crescendo and decrescendo

I read the final sentence: "Playback of crescendos and diminuendos is only effective from one note to the next; it currently is not possible to change the dynamic over the course of a single note. By default, hairpins will affect playback only if dynamics are used before and after the hairpin."

In the example below, I managed to get a decent 'descrescendo' but to my surprise, the notes played further to the hairpin with 'pp' (3rd bar) are played as loud as a 'mf'. Shouldn't the last 'pp' continue to affect the volume?

Also, there was talk that work was being done to resolve the issue of dynamics over just one note. Any progress there?