DMS | Production | Copy template | Text Type | Unable to create Template

Environment: Prod
Login: Admin
File Type: TEXT
Browser: FF and Chrome

Steps:
1. Admin Login > template Library
2. Text Template > Copy
3. Add New field using @
4. Update mandatory details
5. Create Template

Expected; Admin should able to create template using Text and adding new fields.

Actual: unable to create template after adding new field.

Note: With existing field User can create template

Refer screen capture.