pcbkit fab always exported Gerbers with --subtract-soldermask, erasing silkscreen placed in mask openings on purpose. One black-mask diffuser board with white numerals in the windows had to bypass the tool and call kicad-cli directly.
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.