Hi-ho, this issue has persisted for at least a month or two now. Assets flicker on and off, some avatar settings too. It's mainly on newly edited ones though, including my own, even if I only have one such example currently to test with.

I've deleted the %appdata% folder without any success, same goes for the VRChat main folder

The built-in debugger also doesn't report anything weird flickering on my own avatar, but I can CLEARLY see it doing it anyway in first person and the mirror

I've hit a bit of a dead end, and everyone else I ask is also equally as confused. So I'm not sure what I do anymore since everything else works just as always