Dolby Vision on Xbox not working

So I tried playing a movie that has has DV on my Xbox Series X and it didn’t not play with DV, instead HDR10. I know this is a bug with the Xbox version of Plex because it played it perfectly on my Firestick perfectly (I get a prompt the video is playing DV on my TV). The movie worked perfectly fine about a month ago on my Xbox but now only goes upto HDR10. I have also tried other Movies/TV shows that support Dolby and none of them work on my Xbox but they do on other platforms.

Is anybody else experiencing this issue?

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