Ok, this is weird.. I simply move the translate up inside the sphere_sweep
object and added a second union around the markers and got the image below in
3.7...

I was previously seeing the same result as you with the bounding issue.

union
{ sphere_sweep
   { cubic_spline 6,
     <1, -1>, R,
     <-1, -1>, R,
     <-1, 1>, R,
     <1, 1>, R,
     <1, -1>, R,
     <-1, -1>, R
     bounded_by { box { -<1.5, 1.5, R>, <1.5, 1.5, R> } }
     pigment { red 1 }
   translate 1.5 * y
   }
   union
   {
   object { Marker translate <1, 1> }
   object { Marker translate <1, -1> }
   object { Marker translate <-1, -1> }
   object { Marker translate <-1, 1> }
   translate 1.5*y
   }
}

Sean

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