Hi Sebkletel,
We have considered the reported issue "The header and footer template are not working" as a bug from our end and the fix for the issue will be included with our upcoming patch release on end of May, 2023.
Now, you can track the status of the reported issue through the feedback link provided below:
https://www.syncfusion.com/feedback/43659/the-header-and-footer-template-are-not-working
Disclaimer: "Inclusion of this solution in the weekly release may change due to other factors, including but not limited to QA checks and works reprioritization.
Regards,
Yohapuja S
