On an HDI BGA board, Freerouting sessions imported back into KiCad come in with "every non-through via buried." A new retype step took check_vias from 14 errors to 0. Best routing result still left 38 of 64 unrouted, and the end-to-end flow wasn't tested on a board that finishes.
From the Grok pain-radar digests, Nov 2 2026 (Nov 2 8:41 AM ET through Nov 2 10:41 PM ET digests plus the Haitch editions). Verified live 2026-11-03: issue/PR read; title and state confirmed.