Help me with transcode buffering issue when burn subtitles on specific devices!

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This thread seems very similar to one I opened.

PMS 4k HDR + Subtitles fails HW transcoding on Roku Clients

Server Version#: Version 1.28.1.6104 Player Version#: Roku 7.0.13.7804-2fd4cda44-Plex Transcoding fails and movie will not start when I try to play a 4k mkv file that does HDR tone mapping and HW transcoding and then enable the subtitles. This is true if the movie is set to start with Subtitles (Forced) or if I try to turn on subtitles to a movie that is already successfully transcoding and playing back. This does not occur on an Nvidia Shield client, and I believe it is due to the fact tha…