If you are going to a non-english speaking country, do not expect anybody to speak english. Learn some basic phrases on the local language.
If you need any medical assistance, do not hessitate and go to a hospital. Even better if you have some travel insurance.
Do not propose. Thank me later.
I’ve found that as well with some files. At first I thought the issue was with the jellyfin instance had not enough capabilities, but after trying the same file with its subtitles, it worked on any other client: flatpak, web, and regular android. So for me it is the chromecast/androidtv device, so I am now looking what to replace it with