HAPLiteAC as a switch problem passing traffic on ether1

I am testing a configuration in which I am using the HAPLiteAC as a switch. I have traffic from the wired and wireless interfaces communicating without any problem. However, a device in an upstream firewall (PA200), which is in the same vlan as the HAPLiteAC, cannot communicate with the internal hosts. I made sure that ether1 is in the same bridge as all the other devices, however, neither internal devices can talk to the one outside (an RPI), nor the internal (RPI) can talk to the internal devices. Internet traffic going through the PA works just fine, and internal devices can ping the PA200. Any ideas on why this is happening? Thanks!