All new generating tokens are expiring

Hi all,
Recently we faced an issue across all envs at the same time, one API is trying to generating tokens which has access life span of 5000 days but all tokens are expired and getting 401. But when we try to change from 5000 to 4999 days it’s working and it’s generating valid tokens. Is there any chance of limit the generating tokens on 5000 days which we are using since from Years.

Regards,
Rajesh