Totally distorted output when using Plex for LG and subtitles are enabled

Server Version#: 1.18.1.1973
Player Version#: 3.13.28
TV Model: 42LB6500
webOS Version#: 1.4.0
NAS: QNAP TS-453B

I’m not sure if the problem begun with the latest PMS, but I just noticed that when subtitles are enabled, the transcoding goes terribly wrong. Audio is okay, subtitles are okay but video is not.
When subtitles are off, either with the need of transcoding or not, the video is displayed correctly.
Additional details:

  • No recent settings have been changed on the server.
  • Tried different formats (x265, x264, MKV, MP4), same problem.
  • Problem happens either with SRT or PGS subtitles.
  • Already tried removing and reinstalling Plex for LG.
  • Problem only present on the TV, other devices can play the content without issues.
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