What is “Unexpected Machine Code”?

I got message as the subject from iTunes connect when app was uploaded.
Also, I saw strange red exclamation mark without any massages on top of the app page on iTunes connect.

A week ago, it did not any happen.

What is the message

Apparently, it's just a bug.

Ref link

https://stackoverflow.com/questions/38061045
https://forums.developer.apple.com/thread/50328

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