As he points out, if you are using Annotation,you need to be careful when editing Projects in this version of Studio. I also use Annotation, so the current situation is a bit troubling.
Issue One.
When clicking the save button, the Main Annotation disappears from the display. It will appear when you open the project again.
Issue Two.
If you edit an Annotation other than Main, click the Save button, edit an Annotation other than Main again, and click the Save button, not only the display but the value itself will disappear.