kicad-cli pcb export step (KiCad 9.0.9) gives different bytes on every run once tracks, pads or zones are included, while the board body alone is stable; not threads, not ASLR, so the shipped Bazel rule exports the body only. You can't diff or cache the copper model.
From the Grok pain-radar digests, Oct 28-29 2026 (Oct 28 8:41 AM ET through Oct 29 early-morning Haitch editions). Verified live 2026-10-29: issue/PR read; title and state confirmed.