Using subtitles causes video to stutter

[CREATERR 2]

tvos 18.0 , emby app 1.8.9(13)

At the same time, the subtitles are garbled，like ▢▢▢▢▢▢▢▢.

The subtitle file is attached. I thought it was a subtitle format problem at first, but it can be played normally on Apple TV and other similar video software.
It can also be played normally on PC web (server4.8.10.0) and iPhone & iPad (2.2.29).

Video format: 1080p HEVC Main 10 23.976 10bit 6 mbps

Subtitle file is in the attachment

I just found this problem when watching the video. I don’t know if it is a bug, so I gave feedback.

S03E10 - [Snow-Raws] OVERLORD III 第10話 (BD 1920x1080 HEVC-YUV420P10 FLACx2).ass

[visproduction 250]

Create,

Is this font fz-xiao-biao-song-b05, just missing from either the server or end user?  Apple TV has it available so the Chinese characters appear correctly.  I use a subtitle editor on Windows 10 workstation and the font appears to work fine.  In my File Editor the encoding shows up as UTF-8 + BOM and also looks fine.

Related link regarding this font: https://duckduckgo.com/?q=FZXiaoBiaoSong-B05+Windows+font+fails+error&ia=web
So why do some characters disappear to blank squares?  

Here is what the subtitle editor shows about the .ass file.  

Hope this helps...

 

 

[Luke 39624]

@CREATERR

 

Hi there, let's look at an example. Please attach the information requested in how to report a media playback issue. Thanks!

 

[SamES 993]

I think this is the bug that was introduced by tvOS 18 and is fixed in the next update.

[Luke 39624]

@CREATERR?

[CREATERR 2]

I restarted the emby server (dms7.2) and apple tv and it worked fine.

embyserver.txt