Naming series format instead of naming series result

[tikmku]

Installed Apps
Education: v15.5.0
ERPNext: v15.31.5
Frappe Framework: v15.36.1

Problem:
every time we were trying to print student details, the print format page always displaying "Naming rules format, e.g. EDU-STU-.YYYY" instead of its calculated results, eg. EDU-STU-2022 or EDU-STU-2024.