New Mobile app breaks Live TV

iOS 18.7.1 (Plex 2025.28.0)
iOS 26.0.1 (Plex 2025.28.0)
Plex 1.42.2.10156
10th Gen Intel i3 with Intel Quick Sync
OS Ubuntu 24.04.03 server (dedicated server only running Plex)
Hauppauge WinTV-quadHD
No virtualization / No containers

Live TV is working fine on our iPhones. It was buggy when the rollout was new. But, we’ve always been able to use Live TV.
This post might have some relevant info.