On my LG CX TV, the subtitles are synced but the media files are out of sync

[tuzidaguai]

Jellyfin server:jellyfin_10.9.11-amd64.zip Win10 64bit (all with default settings)
jellyfin client: webos 1.22 (disable Prefer fMP4-HLS Media Container, others remain the default)
LG CX, WebOS 5.5.0, uses the TV's native speakers
Test movie directory D:\test-movie
Test movie filename, video.mkv, video.srt (play media files with PotPlayer on PC, subtitles perfectly synced)

Use the above environment to play movies, because my CX TV does not support DTS audio encoding, so Jellyfin will convert DTS to AAC, and the video will be pass-through, so the system works in Direct Stream mode.
After randomly fast-forward and rewind multiple times, the audio-video and subtitles are out of sync during video playback. However, the result of my observation is that the time of the subtitle is synchronized with the time of the LG Jellyfin client player, and the time of the media file is not synchronized.

PIC1: This is a screenshot of playing 13:57 with PotPlayer on PC, Video.MKV, video.srt perfectly synced

PIC2: Here's a screenshot of the subtitles that video.srt should show at 13:57

PIC3: This is the 13:57 picture played by LG WebOS Jellyfin Clinet, you can see that the time of the subtitles is correct, and the time is incorrect when Video.MKV