OCCT's boolean can miss a shallow crossing between two nearly tangent curved faces, and in a ball-through-cone sweep 24 of 500 cases were misread as contains or touching, hiding a clash.
From the Grok pain-radar digests, Nov 1-2 2026 (Nov 1 8:41 AM ET through Nov 2 7:41 AM ET digests plus the Haitch editions). Verified live 2026-11-02: issue/PR read; title and state confirmed.