As I’m looking into this more, I’m increasingly convinced that UE-27979 might be fine, and it’s just Get Tangent At Distance Along Spline that’s the culprit. I can’t exactly reproduce the bad spacing I was having before, but I am finding that the tangents are bad, and might have just been covered up in part in my screenshot. I’m going to be posting an update comment or answer on here, and maybe filing a new bug, in a few hours.
Here’s a teaser screenshot from my further investigations; the far pipe has the tangents returned from Get Tangent At Distance Along Spline; the near pipe has ‘fixed’ tangents.
