SOLVED: ASS subtitles stopped working on Android TV client

[SquishySquash]

What are your hardware specs?  And can you share your full Jellyfin log (not ffmpeg log) via pastebin?

Jellyfin server is running via docker (container manager) on Synology NAS DS423+ ( Intel Celeron J4125 quick-sync capable CPU), my compose is:

Code:

version: '3.5'
services:
  jellyfin:
    image: jellyfin/jellyfin:latest
    container_name: jellyfin
    network_mode: host
    volumes:
      - /volume2/docker/jellyfin/config:/config
      - /volume2/docker/jellyfin/cache:/cache
      - /volume2/docker/jellyfin/logs:/logs
      - /volume1/Data/Media:/media
    restart: 'unless-stopped'
    environment:
      TZ: Europe/Warsaw
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128
      - /dev/dri/card0:/dev/dri/card0

TV with Google TV OS, Android 11, Android Client version 0.18.3, Jellyfin Server 10.10.3