Nov 3, 2026, 9:44 PMFixed: Only a single core is available when you boot Linux or other third-party operating systems from a custom raw boot object on Mac computers with M5 Pro, M5 Max, and M5 Ultra chips. (182898702) (FB23916610)
The bug I filed was fixed ^-^
https://developer.apple.com/documentation/macos-release-notes/macos-27_3-release-notes