Same here.
Everything I'm finding points to this being a temporary issue on apple's side.
https://developer.apple.com/forums/thread/25267
https://github.com/fastlane/fastlane/issues/17330
'* edit Just got it to upload on my 5th try.
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Same issue here after making very few code changes. I'm trying to understand, does the "Processing" they do for the App Store remove certain libraries?