I completed the upgrade of my main Macbook from 12.6 to Ventura 13.1.
So far so good.
The only issue using Xojo 2019r1.1 I have encountered, so far, is that IDE Scripting can fail. There is an easy fix, see PropertyValue(“App.MacOSXAppName”) doesn't update (Ventura, Xojo 2019R1.1) - #2 by Mike_D