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I've got a scene with a track.

Scene view

I've created a script that places light probes along the track to create a volume extending either side.

Light probe view

However, as the vehicle moves along the track, incorrect lighting is applied, as shown here:

enter image description here

It's easier to see in a video: https://youtu.be/BxRdZJvxYeY

I've tried increasing the light probe density all the way up to 1 slice/meter, but it doesn't help.

My lightmap for the terrain is 2048x2048 and I'm using 64 direct samples, 20,000 indirect. There's a little noise but it's quite smooth.

Placing a large number of spheres shows the inconsistency:

enter image description here

What am I doing wrong? Why am I getting light where I shouldn't and vice-versa?

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