So to summarize: it took 19 hours after the public release of a new XCode version for it to be able to distribute to the app store. This is somehow considered acceptable? It's like buying the new iPhone on release day trading in your old one but you can't do any calls on day 1. Emergency? Not today! Seriously, this really should not happen and should not be considered acceptable 'because it happened before'.

The update was finally reviewed within 5 minutes and approved. Total waiting time: 4 + (resubmit) 5.5 days with an expedited review. I really hope future review times decrease again, it's frustrating for developers and users when trying to ship a critical bugfix update.

Still "Waiting for review" three days later after the re-submission, even after another approved expedited review request. So I'd advise others not to re-submit with Duo screenshots, looks like that was not blocking it... Looks like the app review team is just completely overwhelmed right now? I'm getting more and more complaints from my users who run into the bug I'm trying to fix with this update - it's worse than a crash as it destroys an existing apartment scan.. :(

I ended up resubmitting the app with new iPhone Duo screenshots yesterday, hoping that's the issue - maybe there was a preference for iPhone Duo apps in the last week for obvious reasons..