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One thing I noticed was that without a full set of explicit rotation values, your pentagon example ends up slowly rotating 144 or so degrees within a full circle. You can see this in the attached image. Depending on which axis you extrude / rotate around, the amount of unexpected rotation changes.

If you want to actually just do a straight extrude along a path without the undesired rotation, you need to supply a rotation value for each step in the path.