Deleting the ~/Library/Developer/Xcode/iOS DeviceSupport directory content did not work for me. And unpairing the devices over the "Devices and Simulators" panel was not helping either. After successfully loading and running the project on Xcode 12, the app hangs nearly a minute on the app launch image and then run perfectly without errors. The long time is enoying and I hope to find a solution soon! I had this issue since Xcode 12 and iOS 14.
MosTwanTedT
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