Labels and new variables don't work on Blueprint templates

Summary

If labels or new variables are added to Blueprint templates, pages created from this templates won't have these variables/labels.

Steps to Reproduce

• Open one of Blueprint templates on edtition mode
• Add labels and new variables to the template
• Save the template
• Create a new page using the template you modified
  • The labels won't be added and the variables won't be shown

Expected Results

Labels should be added and while creating the page the user shou;d have the option to fill the variable

Actual Results

New variables and labels will be ignored by the pages created from template.

*If the new variables and labels are added on a template created by the users then labels/variabled will work as expected for new pages

Workarounds