[Solved] Bright Spot In Reflection Probe Reflected Skybox

When using a reflection probe on an object, I can get a reflected skybox pretty easily, but I'm also getting an odd bright spot that looks like it's supposed to be a sun or something in the reflection. I generated an image of the phenomenon in a debug scene, which is attached.

There are no lights in the scene, except for a distant light with 0 intensity that is set as the sun for the scene. Removing this doesn't help, either. All sides of the skybox used are solid colors, yet the bright spot persists. The bright spot is not visible in the background, even when the skybox is rotated.

Obviously, this would look unnatural during night scenes, which is where I first noticed it. Am I missing some setting?

 

Turns out the bright spot was caused by a light source that is only momentarily present when the reflective object was instantiated, and the probe was configured to update only on awake. Refreshing the probe sometime later removes the bright spot.