Hi Youwei_767,
Thank you for sharing the experience with us. From the information you provided, it seems the issue happens when you are trying to create a calculated column in an issue tracker list.
When I test from my side, use the same formula as below for a calculated column, the column is successfully created.
=DATE(YEAR([Date reported])+[Cycle],MONTH([Date reported]),DAY([Date reported]))
For troubleshooting, you may try following ways:
1.Create a new calculated column in the same SharePoint list and check if the formula works.
2.Create a new SharePoint issue tracker list and try to create a calculated column, see if the formula works.
3.To narrow down if issue only appears in a specific SharePoint site, you may also use a different SharePoint site and check the result.
Appreciate your time and effort on this issue.
Merry Christmas!
Best Regards,
Tina