I have tested trunk and apv staging branches. In both dilation produces red and green patches, I checked surrounding light probes but could not find any probes that could affect such color change.

1) Open spotlight project https://github.com/iM0ve/Spotlight-HDRP/tree/APV (apv branch)
2) Enable dilation
3) Bake

Check the concrete blocks above the tram.

If dilation is off, I dont get the strange artifacts.
APV staging image looks less red because new feature Leak Reduction, masks the problem.