Thank you for reply. I've reported feedback with screenshot. FB number is FB15352827. I didn't attach the sample project because I didn't think it was necessary.

I think it's correct answer! THANK YOU FOR YOUR POST @SwiftWizard! But I can't delete arm64, because I use CocoaPods, CocoaPods add "Excluded Architectures" to my project . So I tested build with choice "DEVICE", not Simulator. Finally, I could watched build error! and it doesn't disappeared. I think this is the solution for someone who uses CocoaPods.