4k files hardware transcoding no longer works

Plex Media Server NAS & Devices
1

Server Version#: 1.40.3.8555 on Synology DS423+
Player Version#: 10.18.0.968 (cf7c30d2) on NVIDIA Shield Pro 2019

Hi everyone,
I realize today that the hardware transcoding of files in 4k h265 no longer works. Files in 1080p h264 still work though. CPU is used instead of iGPU, making playback impossible. This does not come from the files because these same files worked perfectly before. I made no changes in the settings and the hardware transcoding is enabled in Plex. I tried to restart the Plex service and the NAS but it did not solve the problem.
Would anyone have a solution to this problem? Thank you very much.

Just tried the beta version 1.40.4.8626 and same problem…

I know realize that when the HDR tonemapping is disabled, hardware transcoding is working fine with 4K files…but I need it !

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