Incomplete or No EPG on HD/DVB-T2 Freeview Channels (opens in new tab)

I am a new Tvheadend user, and I am trying to get set up with it to receive Freeview OTA channels in the UK\. I am currently using a Raspberry Pi 4 Model B with a Hauppauge WinTV-dualHD USB tuner\. Installed operating system is Raspberry Pi OS based on Debian 13 Trixie\. I'm using the linuxserver\.io Docker container for Tvheadend\. I have tried using the official Docker image but for some reason it would never detect my tuner, but the linuxserver\.io version does\. I've got the tuner working...