On their corpus, 50 PCB diff pairs had no pair directive behind them and the Class Generation switch was ignored once a PCB class existed, so schematic intent and board state drifted silently.
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.