Update [12/10/2023]:
Similar issue has been reported by
ミツアミめがね
on Linux in the replies.
When attempting to upload an avatar using the Apple Silicon native build of Unity 2022.3.6f1, the editor hard-crashes just after the packaging phase (when the SDK usually takes over and displays progress, after shaders are compiled and stripped, and scripts are compiled, and everything is bundled).
Editor Log reports:
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Native Crash Reporting
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Got a segv while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application.
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Current Additional Packages:
  • Poiyomi (latest)
  • Gesture Emulator (latest)
  • AV3 Emulator (latest)
  • VRCFury (latest)