Last year there were also lots of claims of statistical irregularities in the movement of vote tallies, and demands for investigations, which they mostly didn't get. Or in which they got a fake investigation at least - I remember seeing one video someone had secretly filmed inside a counting centre where some volunteers doing a recount were trying to report that a large run of ballots had identical signatures, and the overseer was telling them to ignore it, that it wasn't their job to report fraudulent ballots!
You're also making the rather generous assumption that this was an actual error. As other commenters observe, "test ballots" for which you need >100k of them, which contain real candidates names and which are posted to the production database do not sound like any defensible testing strategy. If it's genuine incompetence it's of the form that in the civil engineering world would send people to prison.
