I tried all sorts of tricks to try and eliminate the problem, but no luck:

Scaling both cube and sphere-sweep (both before and after they are created), as
well as the sphere radii; changing the sphere-sweep 'tolerance' value by orders
of magnitude up and down (which seems to have no effect at all); rotating only
the sphere-sweep in space; changing the number of entries in the sphere-sweep;
even moving the camera around. Adding commas after the 'sweep entries (as
recommended in the docs) has no effect either.

Using a b_spline instead of cubic also shows the problem.

Using union (or merge!) instead of difference results in NO problem; those
operations work OK.

I assume that this is your only sphere-sweep that uses a CUBIC spline?

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