OK, I found out what was going on. I built the road spline based on the video demo. In that video, they assign the spline directly to the root node. It seems that when you do that, it forces the spline elements to be dynamic which prevents the lightmap baking. The solution was to parent the spline to a Scene component and set the scene to static. That makes everything generated by the spline also static and you get a baked lightmap as a result.
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