In my case solution was found after month or so discussing with several guys from the tech support. Problem was in the project itself.
I set on Maps support in the Signing & Capabilities, but no Routing mode was set, and no Routing area was provided in the AppStore info. page. As soon I removed this entry from the XCode project (as I do not provide route info in release version), error was gone.
So my advice is just check for something non-obvious and exclude any features from the project, which are not used.
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Reproduced again, XCode 12.4. And no comments from Apple' tech support at all. Grave silence.