Apple TV 4K / Dolby Vision switches to HDR


I just tried playing back some DV 4K remuxes on my ATV 4K hooked up to a LG OLED. Those files are single layer and as far as I read, they should be supported by Infuse. The ATV is set to DV and DV works in the menu and for movies bought on iTunes. But when I try to play back one of the files, it will always switch to HDR (and back to DV when I stop the playback). Is there some kind of setting that I should check or is there anything important besides the file being single layer?

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