FYI we solved this problem. It turned out we did in fact have a retry hidden within some of our backend code that was retrying using the same token that then caused this error. As for why it only really seemed to affect the app reviewers, we aren't really sure. The current hypothesis was that perhaps there was something about the accounts of these users that caused the API to be slower to return a response that then timed out and caused the retry.
scott222
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We've also submitted two different apps on Friday and neither of them have dSYMs as of today (monday)
I submitted a ticket to Feedback assistant, and someone replied yesterday that the issue had been resolved. I guess we'll find out on the next submission.
FWIW i'm also experiencing this issue, and thus far, the only solution has been to add back in the padding manually. No real input on the underlying cause.