Steam Fossilize doesn't seem to work on Nvidia cards

Hi, i’m running a bazzite system with a 4080 Super since a few days.
All the configuration is the default one, so i have Shader Pre Caching enabled on Steam parameters.
Fossilize files are GPU agnostic, if i’m not mistaken.
.foz files are being downloaded with the game, Vulkan Shader pre compilation happen before the game launch, just after I click on the play button on Steam.
But the shader cache generated is never utilized, resulting in the same in-game pre compilation as on Windows, for example on Horizon Forbidden West or Silent Hill F. Also resulting with shader compilation stutters on Silent Hill f, or Final Fantasy 7 Remake Intergrade.
It seems to me, that Fossilize is completely useless at this moment, and this is not the intended behavior.
Thanks