Hello @ALISTAIR_GREEN, thanks for your report! Are you able to produce a video of this behavior? I also have a Pixel 3 and would be happy to follow your steps, thanks! Also, can you please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.