A visible seam is observable during SubD operations on a boolean cut.
Prior to applying the Boolean I created supporting edge loops which are not approximately* in line, they are exactly* in line, ie. mesh topology looks so good it brings a tear to the eye.
Despite this, for the past 2 weeks this issue persists. Weighted normals and proximity loops help the overall shape, but only minimize this particular effect. A blend file should be attached. Picture illustrates issues.
Is anyone able to identify this issue, and what the solution is?