Im not certain if its a problem with the debug mode or the touchup volume itself.

Repro:
1) Open Spotlight Tunnel project apv branch https://github.com/iM0ve/Spotlight-HDRP/tree/APV
2) Load Main then Day scenes
3) Bake lighting
4) Enable Validity Over Dilation Threshold debug mode
5) Navigate to the location from the screenshot (above the tram). There should be some red probes.
6) Add touchup volume with threshold 0 (see img for location)
7) Bake

Expected: All probes are green
Result: Probes int he corner are still red

Optionally, you can set the threshold in APV settings and delete the touchup volume. Then all probes would be green as expected after the bake.
More context: https://unity.slack.com/archives/C0108P9UH6H/p1652873578098699