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I have the same problem after updating to Catalina official release. The message cited "Class..... is implemented in both...." is logged on my machine for: Excel,CoreServices, SyncedDefaults, CommercialCore. Besides this, I have intermittently got a failed touristd process running every minute and something called "AMMuxedDeviceDisconnected" errors. This is seriously slowing down my system. Luckily have my Linux machine still running.Not amused.