Fire Stick 4k MAX - Black screen with HDR10+ content

Plex Players Streaming Devices
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Server Version#: 1.24.5.5160
Player Version#: 8.25.1.28703

Hello,
I bought the Fire Stick 4k MAX and have a problem.
When I play a movie in HDR10 +, I get a black screen with the sound

If I play the same movie on the same TV with the Fire Stick 4k (old version), I have the picture and the sound

The versions of Plex are the same on both devices.

On the 4k MAX, I tested with VLC and the problem is the same, on the other hand, with Kodi 19.3, it works perfectly.

Do you have an idea ?

Thank you

<Media id="27604" duration="8995495" bitrate="4954" width="3840" height="1608" aspectRatio="2.35" audioChannels="6" audioCodec="ac3" videoCodec="hevc" videoResolution="4k" container="mkv" videoFrameRate="24p" videoProfile="main 10">

<Part accessible="1" exists="1" id="27634" key="/library/parts/27634/1635396737/file.mkv" duration="8995495" file="/volume1/media_center/Films/Fast & Furious 9 (2021)/Fast & Furious 9 (2021).mkv" size="5570791197" container="mkv" videoProfile="main 10">

<Stream id="57852" streamType="1" default="1" codec="hevc" index="0" bitrate="4506" language="Français" languageTag="fr" languageCode="fra" DOVIBLCompatID="1" DOVIBLPresent="1" DOVIELPresent="0" DOVILevel="6" DOVIPresent="1" DOVIProfile="8" DOVIRPUPresent="1" DOVIVersion="1.0" bitDepth="10" chromaSubsampling="4:2:0" codedHeight="1608" codedWidth="3840" colorPrimaries="bt2020" colorRange="tv" colorSpace="bt2020nc" colorTrc="smpte2084" frameRate="23.976" height="1608" level="153" profile="main 10" refFrames="1" width="3840" displayTitle="4K (HEVC Main 10 HDR)" extendedDisplayTitle="4K (HEVC Main 10 HDR)"> </Stream>

<Stream id="57853" streamType="2" selected="1" codec="ac3" index="1" channels="6" bitrate="448" language="Français" languageTag="fr" languageCode="fra" audioChannelLayout="5.1(side)" samplingRate="48000" displayTitle="Français (AC3 5.1)" extendedDisplayTitle="Français (AC3 5.1)"> </Stream>

<Stream id="57902" key="/library/streams/57902" streamType="3" selected="1" forced="1" codec="srt" language="Français" languageTag="fr" languageCode="fra" format="srt" displayTitle="Français Forcé(e) (SRT Externe)" extendedDisplayTitle="Français Forcé(e) (SRT Externe)"> </Stream>
</Part>
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I just swapped out a 4k stick with a 4k max. Similar problem except instead of black screen Plex is transcoding HDR10+ to HDR10. Playback Info says direct play failed. Old device doesn’t have this issue. All Plex and FTV display settings on new device are the same.

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