Welp, This was requested to be moved to this forum (from the discussions.apple.com forum) due to the 'beta' issues. Kernel panics continue today on the release version of 11.3. ProductName: macOS ProductVersion: 11.3 BuildVersion: 20E232 I'll ignore this thread, and reopen the issue with Apple Support.

@eskimo, Is this the kind of information you're looking for? Feedback ID sent in February: FB8989607

Upgraded to beta 4. System kernel panic upon reboot. Can't modify clock via dock in system preferences. Found this in etrecheck: Diagnostics Information (past 7-30 days): 2021-03-20 02:48:45 ControlCenter.app Crash (41 times) Executable: /System/Library/CoreServices/ControlCenter.app Details: dyld3 mode CoreUI: Error Domain=NSCocoaErrorDomain Code=260 "RunTimeThemeRefForBu ndleIdentifierAndName() couldn't find VibrantLightAX.car in bundle wit h identifier: com.apple.systemappearance" UserInfo={NSLocalizedDescrip tion=RunTimeThemeRefForBundleIdentifierAndName() couldn't find Vibrant LightAX.car in bundle with identifier: com.apple.systemappearance} 2021-03-19 18:21:39 Dock.prefPane Crash Executable: /System/Library/PreferencePanes/Dock.prefPane Details: dyld3 mode Crashing on exception: -[SOVoiceObject isAppropriateForSystemLangauge] : unrecognized selector sent to instance 0x6000011206f0 kernel panic after beta 4 update - https://developer.apple.com/forums/content/attachment/c6c011b8-2118-4444-96e6-09b229083afa etrecheck - https://developer.apple.com/forums/content/attachment/696add18-d207-4282-aec6-2f1866d383ac

Problem still happening at beta 4 of Big Sur. Feedback assistant report filed. FB9048679