Please elaborate how you’re testing for everyone’s benefit, and how you know your image viewer and OS do the “right thing”?
For example, both ICC and CICP AVIF variants look identical to me in Windows’ paint.NET 4.2.15 on an SDR display, but I’m still not 100% confident if I’m seeing the “correct” rendering, or what I should indeed be expecting to begin with. The midtones look almost the same as the attached sRGB JPEG below (history discarded in dt, just straight import->export), but the highlights not clipped as much and have softer roll-off (I gave them the extra 1.36 EV after all), and I think that’s right, they should just look nicer & brighter on a real HDR display?
OTOH, in Chrome they look different to each other, and both “incorrect” to me (either too dark or too bright & clipped) when compared to the sRGB JPEG.
Edit: Here’s a screenshot of the Windows Explorer thumbnails to show what I mean above; I’m guessing the Windows AV1 plugin from the store behaves the same as paint.NET:
