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indeed it's odd, I had couple of 4K videos before the update and they still work but not new videos, I hope we get feedback on this soon .
You might experience that certain HEVC 4K video content can no longer be played back on the Xperia™ Z5 Premium after the update to Android™ 6.0. HEVC 4K content is supported for videos with up to 30 frames per second (fps). Before the update, this limit was not checked correctly by the HEVC decoder, and videos with 50 fps could be played back incorrectly by dropping frames and not reaching 50 fps. After the update to Android™ 6.0, the HEVC decoder strictly limits playback to videos with up to 30 fps. Videos above this limit cannot be played back.