I have the same problem connecting from Mac running Big Sur to another running Big Sur, so I can't easily copy files such as Xcode 12 beta. My only option at the moment is going from Big Sur 1 --> Catalina --> Big Sur 2.
wibw
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@aleroot, on a freshly installed 11.1 (20C69) on M1, that command returned "arch: posix_spawnp: bash: Bad CPU type in executable". So, Rosetta is not present in 20C69.
One simple check I did is to fire up our older version of our installer where I haven't added arm64 to the optional hostArchitecture in distribution XML. If Rosetta is not installed, the OS will request that I install Rosetta.
I can also use a script from Der Flounder and modified it just to check.