I was trying to be smart about things and make use of our
`SynchronisationContext` setup, but it turns out to not work in all
cases due to the context being missing depending on where you are
calling the method from.
For now let's prefer the "works everywhere" method of scheduling the
final work back to update.
Less abstraction is better. As far as I can tell, we don't need a custom
model for this. If there's any tracking to be done, it should be done
within `BeatmapCarousel`'s implementation (or a filter).