I have continued to troubleshoot the issue.
It appears that when a packet is bound for external access it does not get sent though the WAN interface. Using Services -> Packet Capture I can see my ICMP packets being sent to the LAN Default Gateway and being let out the Firewall but the packet does not get captured on my WAN Interface.
Client -> LAN Interface (Packet Captured) -> WAN Firewall (Passed) -> WAN Interface (Not Captured) -> Home Router (Not Seen)
It appears that when a packet is bound for external access it does not get sent though the WAN interface. Using Services -> Packet Capture I can see my ICMP packets being sent to the LAN Default Gateway and being let out the Firewall but the packet does not get captured on my WAN Interface.
Client -> LAN Interface (Packet Captured) -> WAN Firewall (Passed) -> WAN Interface (Not Captured) -> Home Router (Not Seen)