Now Chinese char will show like ⎕⎕⎕⎕⎕⎕⎕⎕ ⎕⎕⎕⎕⎕ (blocks).
Chinese ASS was working fine b4 update to tvOS beta 18.
SRT got no issue. Only on ASS.
Maybe Apple change some SDK functions?
We’ve had a few reports of this, and it seems to be a bug in the iOS/tvOS 18 betas that affects subtitles which contain certain embedded fonts.
Unfortunately, I don’t believe there is a way to move back to tvOS 17 after installing a tvOS 18 beta. 
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After upgrading to tvOS18 beta [22J5305e], some Chinese subtitles cannot be displayed.
Infuse version: Infuse Pro 7.8 (4868)
Just updated to tvOS 18.0 beta［22J5335d］and issue remain the same.
The issue may be resolved in tvOS beta 7(22J5353a).
Just updated to latest 22J5353a and confirmed ass Chinese characters back to normal display.
Chinese char is broken like the picture showed, and srt is ok, ass is not ok
Mac OS 15.0 (24A335)
Infuse: 7.8.4948
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It appears Apple has fixed this issue on tvOS, but the problem remains on other platforms - even in the RC builds released this week.
We are looking into options for resolving and/or working around this issue.
We’re submitting 7.8.3 with a fix for this issue to Apple today. 
If you’d like to try it early you can join the special TestFlight group using the link below.
Note: Apple is currently reviewing the builds so there may be a short delay before they appear in TestFlight.