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When updated to Oreo (47.1.A.5.51), my album app didn't render the original 4K HDR pictures (.png format) completely.
Here are some screenshots that could explain the bug.
And you can also try to test the four png files in your Pictures folder of internal storage.
(Files:"4KHDR_hero.png", "4KHDR_detail.png", "4KHDR_contrast.png", "4KHDR_colour.png")
Translation via Google Translate:
Do not know if the next version will be resolved, the problem here is that there is no official in person.
不知道下一个版本是否会解决,这里的问题感觉都没有官方的人在。
I experience the same issue. It seems to be an Album app bug. Another app from GPlay renders these images fine.