Trace points deviate from curve when zooming in

[elfalem]

          Here's the use case: 

Zoom out to zoom level 3 and click on Trace Curves

Then start to zoom in; you'll see that after a certain zoom level, the deviation starts to be perceptive.
See the images below:

Originally posted by @aasilva in #20 (comment)

[VitalLato]

I have exactly the same issue.

[davidfdriscoll]

I'm also having this same issue.

For my purposes, I hackily avoided the problem by making the Bezier line opaque and drawing a polyline and arrowhead decorators along the sampled route.