the IFC model diff keys property sets by name, so two same-named sets on one wall collapse into one and the diff reports the wall as "modified" with an empty list of changed components.
From the Grok pain-radar digest, Oct 25-26 2026 (Oct 25 daytime to Oct 26 morning slots). Verified live 2026-10-26: issue/PR read on GitHub; title and state confirmed.