So I installed the latest OS update from Settings not realising that it wasn’t a Monteray update, but Ventura beta. But then when I tried running XCode I get a message that it won’t work with Ventura. So I’m stuck because I was about to release an App, but can’t because the App Store won’t accept stuff built with beta software.
So thanks Apple. Of course it’s all my own fault for not reading the Release notes where it is buried in the detail.