In Peer to Peer ( SSL/TLS ) mode i have tried add "keepalive 2 5" in Custom options on Server side (if type high values, it did not help in client reconnection, but on client reboot higher values works, it's important that keepalive was lower, than client reconnection time take), and seems that it helps shows correct link state on Server side.
Seems that client make "reconnection" very fast, that Server status did not catch new connect in default pfSense's "keepalive 10 120" or something look like this.