The slideshow images in this NYTimes Olympics feature fades poorly. It looks fine on Chrome. https://www.nytimes.com/interactive/2021/08/02/sports/olympics/olympics-2021-soccer-track-gymnastics.html
<rdar://problem/81713748>
I cna see images fading using STP 131 on macOS 11.5.3. If you can reproduce this, please specify what configuration you are using.
Actually, I can see some flashes of black as images start to fade. Is this what you see?