Fortigate Certs Date Change on Power Failure

Hello, for the past few months we've been encountering a bug where after a power failure, or hard reset, some of the certs have had their dates changed. Usually these dates end up changing from something like 2026 to 2006. This happens to our Local CA Certs, and to some of the various SSL certs.

Is this a known issue, and if so is there anyway to preserve or replace the corrupted certs with copies of the originals? Several of our company locations are in rural areas with frequent weather events, leading to power outages even with UPSs installed for each Fortigate.