Hardware Transcoding broken when burning subtitles ApolloLake-based Synology NASes

Plex Media Server NAS & Devices
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I have this issue on my DS918+ regardless of subtitle format when playing on my Nvidia Shield. (Everything plays fine on my Roku 4.)

PMS 1.18.1.1973 FreeBSD/FreeNAS crashing when using the web client and subtitles