I have an external ssd with Big Sur beta installed. Booting to the external ssd works just fine - I upgraded to 20A5395g yesterday. However, I am unable (when booted to 10.15.7) to mount the Big Sur volume. The dialog box that presents itself reads: Could not mount Big Sur Boot - Data. (com.apple.DiskManagement.disenter error -119930868) Is this by design? Can anyone else boot a working Big Sur volume onto a Catalina system?
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