Overview
- Developers and users discovered in the macOS 27 Golden Gate developer beta that the recovery-mode boot picker and Startup Disk no longer detect some alternate partitions, and Asahi Linux reported the behavior as a bug and filed bug report FB22994760 with Apple.
- Asahi says affected Linux partitions remain intact and that no user data has been lost, and it advises anyone who installed the beta to set a macOS 26 volume as the default Startup Disk to restore access to Asahi Linux.
- Asahi has patched its installer so it will not run on macOS 27 until a workaround or an Apple fix is available, and the project says it will not support users who upgrade without a contingency plan.
- Independent testing from coverage of the issue shows older macOS installations on separate partitions can also be made invisible, indicating a wider multi-OS impact beyond Asahi Linux.
- The bug appears in an early developer beta so ordinary users should avoid installing it on daily-driver Macs and watch for fixes in upcoming macOS 27 betas that Apple can issue before the planned public release in the fall.