Fortimanager redundancy with FQDN

Hi,

We are looking at implementing DR solution for a Fortimanager VM across two DCs.

I have found it is possible to specify FM with FQDN on the Fortigates.

However, after testing it seems FG caches FM's IP when it is registered.

Then, even if DNS entry changes and TTL expires, the firewall won't query DNS for a new IP for FM. The only solution seems to be manually de-register and register FG again with FM.

Is there a way to force Fortigates to query DNS for a Fortimanager when the FG-FM connection goes down?

Thanks