LG plex app - embedded subtitle causes high disk usage

Server Version#: 1.24.2.4973
Player Version#: (client) 5.23.1 - (platform) 5.2.3
TV - LG 70UN71003LA
webOS version - 03.23.45

Hi, I have a little problem as i wrote in the title. If I want to use embedded subtitles (srt), it results in high disk usage on the server side. There is no such problem with an external subtitles. Subtitles is set “Only Image Formats”
Why does it load the hdd like this or what should I set it differently?

With embedded subtitles →

Without subtitles →

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