And if you have a live stream in HDR, it will stream in HDR and will be available in HDR until after it is converted into a regular video, then HDR is broken.
But you can cut half a second of the video in the YouTube Video Editor and what triggers some kind of other processing which will restore HDR again!
In summary YouTube (2023 US$31.5 billion Revenue) and which core business is video delivery, storage and processing ... has a broken and buggy core business feature..
after searching in Reddit and forums this error persists for at least 7 Months.
Although about 30%(?) of all views are HDR capable.
https://www.reddit.com/r/youtube/comments/1pcfw2q/youtube_no_longer_detects_hdr_on_any_of_my/
#YT #YouTube