Seriously, the stability for App Store Connect sales page is horrible. This is happening on Chrome and Safari, for a long time.

Same happens to me, this begins after I use Swift Concurrency, not sure if related.

Please add an API to allow reverting to the old tab bar, do not punish developers who like to adopt native UI controls. For some Apps, there will be huge changes needed to satisfy this new Tabbar on iPad, to an extend that it is much easier to just rewrite a TabBar.