Cubase 12 -13 bug (Sierras Atlas 2)

I installed the Sierras Atlas 2 vst. If I create and save a project with a track in which Sierras is present, I can no longer open the file and I lose the entire project. If I uninstall Sierras everything works fine. With Cubase 11 I don’t have this issue. How can I do? Thanx