The MCP tool's four-point surface rebuild kept only a face's corners, so a curved panel with coplanar corners (e.g. a cylinder section) was replaced by a flat surface instead of skipped.
From the Grok pain-radar digests, Oct 26-27 2026 (Oct 26 12:41 PM ET through Oct 27 7:41 AM ET digests plus the Haitch editions). Verified live 2026-10-27: issue/PR/thread read; title and state confirmed.