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Question

1. I regenerate all of the certificates, update the version number of the app

Answer 1

It seems to happen if you are too quick between the build finishing "processing" and it being attached to a version and the version being submitted. I just published two apps in quick succession and the second submission had this problem while the first was fine. The only difference - speed of clicking the submit button.

Logging out and back in made no difference - the "problem" is with the submission.

I removed the just uploaded build from the version and then re-attached it, proceeding as normal to submit the release to Apple with exactly the same build and submission artifacts as before, except this one "saved" and went into the review queue.