When a shape has a calendar event color it does not update it's color correctly when one event ends and the next event comes from a different calendar.
I'm using this watchface: http://facerepo.com/app/faces/details/splitbrain-agenda-14adf31197d
I had an event in one calendar using a brown color. That event ended and now only one event in the blue calendar (Dinner with Theresa) remains. However the shape at the border is still brown instead of blue:
The colors of the text widget changed color correctly.
This might also related to the bug where colors of the shapes are wrong in the preview image when the watchface is exported (see image at facerepo).