Same error for me. I tried Xcode 12.2, Xcode 12.3 beta, doesn't work. My device is iPhone 12 pro max. iOS 14.3 beta 2.
== PREVIEW UPDATE ERROR:
RemoteHumanReadableError: Failed to update preview.
Error encountered when sending 'display' message to agent.
==================================
| RemoteHumanReadableError
|
| LoadingError: failed to load library at path "/private/var/mobile/Containers/Data/Application/16712E81-3730-4827-A26F-A9AA2399EB0B//tmp/C791BCFF-36DF-4238-8C18-38E85FD6FEE0-ContentView.2.preview-thunk.dylib": Optional(dlopen(/private/var/mobile/Containers/Data/Application/16712E81-3730-4827-A26F-A9AA2399EB0B/tmp/C791BCFF-36DF-4238-8C18-38E85FD6FEE0-ContentView.2.preview-thunk.dylib, 2): no suitable image found. Did find:
| /private/var/mobile/Containers/Data/Application/16712E81-3730-4827-A26F-A9AA2399EB0B/tmp/C791BCFF-36DF-4238-8C18-38E85FD6FEE0-ContentView.2.preview-thunk.dylib: code signature invalid for '/private/var/mobile/Containers/Data/Application/16712E81-3730-4827-A26F-A9AA2399EB0B/tmp/C791BCFF-36DF-4238-8C18-38E85FD6FEE0-ContentView.2.preview-thunk.dylib'
| )
ibadcool
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