Site to Site VPN and OSPF appear to have issues with 24.03 and the "Firewall State Policy"
I needed to change this back to the "old" way of doing things with "Floating States"
Once I selected this and cleared my state tables (a reboot would also work for this) everything appeared to be working exactly how it was in 23.09.1
This option can be found under System --> Advanced --> Firewall & NAT. Under the Advanced Options there is a new "Firewall State Policy" Section.
More can be found here: https://www.netgate.com/blog/state-poli ... t-change
"multi-WAN (outbound and inbound), VPN routing, High Availability, and so on" are impacted.
Will try to update this thread if it lets me: https://forums.lawrencesystems.com/t/st ... es/21608/3