We need better soundfont preset retention going from 3 to 4

Example:
I have an MS3 file; it contains four keyboard parts.
They started as piano lines, but they have been changed to different presets.
(synth brass 4, fast strings, pan flute, halo pad)
The preset numbers are stored in the file; I checked.
When you open the same file with MS4 however, it ignores this and gives you four piano voices, with no indication of what they used to be.
This should be handled better.
Thanks