There's a bug in the render script - lighting is not consistent with camera in all rotations. Fix attached...
Ohh - I see. Thank you. Is this likely to have affected vehicles?
Sadly yes...
Hmm - what is the effect likely to have been on them?
The lighting on two rotations will be wrong - so shading on the images will be wrong. My personal view is that unless it looks off in game then not to worry until someone reports a bug, but you could re-render everything you've used the old script on...
Hmm - I shall follow your initial suggestion. That would otherwise involve weeks' worth of re-rendering...