Unable to transcode smoothly with HDR Tone Mapping enabled

Server Version#: 1.21.1.3830
Player Version#:plex for ios 7.11

My device is Synology and my CPU is G5420,

When using plex to play 4K HDR HEVC format video, there was a problem with smooth transcoding,If I turn the HDR Tone Mapping option on。But when I tried to play the same video using Emby, it played smoothly after transcoding。So is there something wrong with my plex setup?

The screenshot below is when HDR is not on
图片

So will it be resolved in a future update?

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