Yes I mean linear profiles.
The avif file uploaded is in Rec2020 lineal which is included in the image.
It seems that the conversion software ignores the gamma curve provided and uses one of its own with gamma applied.
It seems it does not support AVIF files correctly. WebP seems to work well.
Using Adobe RGB in avif file seems to work.
The file was generated using dartable export with RGB Rec. 2020 lineal profile and AVIF format with 90 compression adn 10 bits of color depth.