real IfcOpenShell IFC4 exports checked against the native model with an explicit loss inventory failed exchange check EX-02, came out inconclusive on EX-08, and a roundtrip added four failed observations including bounded-property loss.
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.