Subtitles not found on Jellyfin for AndroidTV

[harexew]

So I'm having a problem with problem with the subtitles in my media files. My files mostly have subtitles in SSA or PGS format and sometimes both, but no matter the format, I have to select them manually every time I start a new episode, otherwise it stays disabled.
I run Jellyfin 10.8.13 on Arch 64-Bit, installed from the AUR Package. Hardware Acceleration is enabled, running on a Quadro P600 with the proprietary Nvidia Drivers.
The Android App is the newest Version available on the Play Store, running on a Xiaomi Mi Box S (1st Gen).
The Media Info from one of the files:

Code:

S01E02
Container: mkv
Path: /samba/media/Anime/Ouran High School Host Club/S01E02.mkv
Size: 301 MB

Video
Title: 1080p HEVC SDR
Codec: HEVC
Profile: Main 10
Level: 120
Resolution: 1440x1080
Aspect ratio: 4:3
Interlaced: No
Framerate: 23.976025
Bitrate: 1800 kbps
Bit depth: 10 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p10le
Ref frames: 1

Audio
Title: Englisch - AAC - Stereo - Default
Language: eng
Codec: AAC
Profile: LC
Layout: stereo
Channels: 2 ch
Bitrate: 190 kbps
Sample rate: 48000 Hz
Default: Yes
Forced: No
External: No

Subtitle
Title: Englisch - Default - ASS
Language: eng
Codec: ASS
Default: Yes
Forced: No
External: No

Audio
Title: Japanisch - AAC - Stereo
Language: jpn
Codec: AAC
Profile: LC
Layout: stereo
Channels: 2 ch
Bitrate: 188 kbps
Sample rate: 48000 Hz
Default: No
Forced: No
External: No

Subtitle
Title: Japanisch - ASS
Language: jpn
Codec: ASS
Default: No
Forced: No
External: No

[TheDreadPirate]

When you say Android I am assuming you mean Android TV. If so, this is a known issue. This is not caused by your server or media.