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.
blueprog
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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.