I apologized for reposting this, but since the forum notifications have gotten messed up, we lose track of topics, and this is one that I care about. So I’m starting again.
In short, in exploding music to the staves below, dynamics not only don’t go with the music, they actually mess up the “explosion.” In a 3-note chord with an forte under it, exploding it results in nothing being moved to the lower staves. What does happen is that the bottom note of the chord is stripped away, and there are now two forte’s attached to it.
I’ve attached three pics: the first shows the original two chords, each in its own measure, one with and one without a dynamic;
the second one shows the result of exploding the two bars one at a time (the one with the mf doesn’t work);
and the third shows the result of exploding both bars in a single action (both bars are messed up, even though only one had a dynamic in it).