Write On behavior on a circle creates artifact

Hi guys,
I created a very simple project: Two circles with two different colors. The upper circle uses the write on behavior to hide the lower circle.
The problem is an artifact that is created during this animation on the circle. You can see it in the screenshot. It happens inside Motion 5 and inside FCPX, even after rendering. Does anyone of you have a solution, or is this a bug?
Thanks,
Chris

Well, it seems like the first and last point offsets show the "animation" icon (the gear), because I applied the write-on behavior to them. The second circle does not have any behavior applied (I just checked my project again and it seems like I deleted its behavior since I opened this discussion). The artifacts are still there.
Here's a new screenshot.

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