A Signex polygon boolean returned a partial or inverted ring when inputs touched or nearly touched, a plausible-but-wrong shape feeding footprint courtyards.
From the Grok pain-radar digests, Oct 27-28 2026 (Oct 27 8:41 AM ET through Oct 28 7:41 AM ET digests plus the Haitch editions). Verified live 2026-10-28: issue/PR/thread read; title and state confirmed.