A root assembly whose default parameters fail but whose occurrence override is valid could not open in the app or over MCP, because the bare root was built first.
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.