Not just you. Switching devices in the prevue triggers the psychedelic display and complete system freeze.
Robvandy05
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This has happened before and is a bug in the beta 4 release tied to an expiration check for the valid timeframe for a build. In this case we are 9 days out from a weekly release cycle, someone at Apple screwed up and set the time check too soon. It’ll be fixed in the next beta release.
The 2017 Range Rover Sport connected via USB has the same problem with CarPlay. It’s unclear if it is a problem with the car side or phone side, since the car won’t be updated.