A tagged group grouped again, or tagged faces put into a group, vanished from the BIM panel, the quantities CSV, the IFC export and Model Info, while the Browser still showed the IFC class on the nested row, so it looked fine; collect_objects only read loose faces and top-level groups, and the fix walks the whole tree, avoids double counting, and fixes id collisions on ungroup.
From the Grok pain-radar digests, Oct 28-29 2026 (Oct 28 8:41 AM ET through Oct 29 early-morning Haitch editions). Verified live 2026-10-29: issue/PR read; title and state confirmed.