Fortiswitch with 802.1x reauth

I’ve just rolled out 802.1x for the first time and it ~~appears~~ as if reauth causes disconnects. In the log it says the port is no longer authorised and then reauthenticates. Is that correct?

I’d have expected the reauth to work similar to IPSEC, where it does it before the expiry time, so that things don’t drop? If it does then fail, then deauthorise the port.