It appears at least some of the 2018 Panasonic TVs have a new IP protocol. I have the TX-65FZ802b OLED screen and the current IP device on longer works. Adding a device recognises the TV and will configure, however, it won’t actually successfully control the device. It appears that connecting to the TV now requires a PIN, which I confirmed by downloading the official Panasonic TV app and it required a ‘pairing’ step when first started (the TV automatically broadcast the pin to input into the APP).
Therefore, please add this new protocol to the device list.