GetDistanceAlongSplineAtSplinePoint becomes inaccurate as point approaches 0% or 100% of spline length

When the USplineComponent::GetDistanceAlongSplineAtSplinePoint() function is called, the value returned is not accurate if the point approaches the range of 0 - 10 % or 90-100% of the spline.

1. Open UE4 Editor
2. Add blueprint based on Actor (ActorBP)
3. Add spline component to blueprint
4. Right click the center of the spline and select Add Spline Point Here (Ref Point)
5. In event graph, add reference to spline component
6. From Spline comp ref, add Get Distance Along Spline at Spline Point node
7. Wire return value to a Print String node
8. Wire input execution pin of Print String to Event Tick
9. PIE with the Blueprint Viewport accessable
10. In the blueprint viewport, select Ref Point and use the widget to drag it along the X axis (red)

Result:
Value printed in editor viewport does not reach 0.

Expected:
Value printed represents selected point's distance from point 0 (start) of the spline