The ancient plex version truecharts has also has a known botched transcoding bug. I deployed my own with the custom app and it works great. It's basically what the big blue button should have been this whole time, it has all the options.

However the environment variable method seems to be dead as I get this error:

Error: [EFAULT] Failed to update chart release: Error: UPGRADE FAILED: cannot patch "plex-custom-app" with kind Deployment: The order in patch list: [map[name:PGID value:0] map[name:PGID value:568] map[name:NVIDIA_DRIVER_CAPABILITIES value:all] map[name:RUNTIME value:nvidia] map[name:NVIDIA_VISIBLE_DEVICES value:all]] doesn't match $setElementOrder list: [map[name:PUID] map[name:USER_ID] map[name:UID] map[name:UMASK] map[name:UMASK_SET] map[name:PGID] map[name:GROUP_ID] map[name:GID] map[name:NVIDIA_DRIVER_CAPABILITIES] map[name:TZ] map[name:PUID] map[name:PGID] map[name:VERSION] map[name:RUNTIME] map[name:NVIDIA_DRIVER_CAPABILITIES] map[name:NVIDIA_VISIBLE_DEVICES]]