Serial Port on RV50 part of VPN?

I have a Site-To-Site VPN tunnel with a test RV50 (with static IP) and connected to my office. I set the settings to Blocked on the Split Tunnel setting on the RV50.

Devices connected through ethernet can’t get to the internet.

When I try though to poll my test PLC through the serial port, I can get through using the public IP no problem. Are there settings on the serial section that I need to adjust?