Steps to Reproduce:
= In Classic PPM :
1. In admin side open Object: Project.
Set Default: Approved
Add Attribute Status in the Layout:Create view and in Layout:Edit
In View: Project Properties - Property Field be sure you don't have Override Default
2. Create a Template.
3. Create a new project from that template in Classic PPM.
Status field shows Approved (like we have it defaulted to do).
= In the New User Experience
4. Create a New Project from that Template.
Notice that you don't see 'Status' in the New User Experience. That is one of the attributes that you can not add, it was not an option to select it. Attribute Status has 'API Attribute ID' grayed out.
5. Open the Project created in New User Experience in classic PPM. Check 'Status'.
The projects Status should be Approved.
The projects show Status Unapproved.
Defaults works fine for attributes that you can add/see in the project in the new UI.