Nautilus now displays everything at whatever the zoom setting is, default is the lowest setting of 50%
(- 50% of something ,not what’s being viewed.
So at least here that, (50%) seems to equate to about 64px . If you view any image in nautilus like icons at or bigger than 64px are sharp, lower get fuzzy depending on how much lower.
It seems nautilus (Gnome) offers 3 zoom levels that equate to 64, 128 and 256px. Why such a large size bias no idea, maybe they fancy themselves as a possible mobile env.