Couple of suggestions - but I've not used Movie Studio 17 (latest I have is Vegas Pro 12) so I hope they apply. You don't mention if it's a crossfade or a fade to black/white.
If it's a crossfade then if you move the track you're fading to above the current track and simply fade that in over the top
fade 1 track to another.PNG
Because there's no fade on the lower track your effects will remain in place.
Alternatively if Movie Studio has a video envelope function then you could also insert a "fade to colour" envelope which will fade to a solid colour on a single track.
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