Well, since this is a new class of problems, we don't know all the edge cases yet.
I'd say that most of the time, you (and others) include the original sound plugins, and this time you didn't, but you bound a new name to an existing sound, and BC didn't like that (or something like that). The fix, in the Foundation, would be detect if it's a sound it already loaded, and if it did, just link it to it, and not reload it or something like that.