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jack
9b8498c78e
CRITICAL: The PeerID version of _handleFragment was accessing incomingFragments dictionary without collectionsQueue synchronization, causing crashes when multiple BLE threads processed fragments concurrently. Crash stack trace pointed to line 3431 (dictionary subscript) with: 'doesNotRecognizeSelector' - classic concurrent mutation crash. Fix: - Wrapped ALL incomingFragments/fragmentMetadata access in collectionsQueue.sync(flags: .barrier) - Matches the thread-safe pattern used in String version - Separate cleanup into its own barrier block after reassembly - Prevents concurrent dictionary mutations from multiple BLE threads This is the same pattern as the String version (line 1128) which didn't crash.