macOS 27 beta 1 boot picker no longer lists Asahi Linux

Category: Apple
Status: confirmed
Sources: Asahi Linux warning, Phoronix, HN discussion
Summary: The first macOS 27 "Golden Gate" developer beta, released 2026-06-08, changes how the boot picker and Startup Disk detect bootable volumes. Asahi Linux's fuOS registration through m1n1 and kmutil stays intact, but the entry is no longer shown, so Asahi cannot be booted from macOS 27. Partitions and data are unaffected. Asahi filed Apple Feedback FB22994760, patched its installer to refuse macOS 27, and advises keeping a macOS 26 volume installed; selecting the older macOS as startup disk restores access. Reports that older macOS installs on separate volumes are also hidden suggest a general boot picker regression rather than a Linux-specific change.
Why it matters: Apple Silicon dual-boot users who install the beta lose access to Asahi until Apple fixes the regression; multi-volume macOS setups appear affected too.
Follow-up: Check whether a later macOS 27 beta restores fuOS entries in the boot picker.