It adds a contour to almost every collectable, being these: dogtags, loot pickups and outlaw raid documents. With the exception being the metal box full of gold (i don't know why would you need it to have a contour, like you could fit all 4 raid members inside that box so i would say that's pretty visible).

Also these loot pickups will have worse graphics:

file name	in-game name
desk_eagle_statue	EAGLE STATUE
desk_vase	GOLDEN VASE
desk_watch	GOLDEN WATCH
faberge_egg	FABERGE EGG
jewelry_box	JEWELRY
kaleidoscope	KALEIDOSCOPE

why is that? because in the game material_config files it has a thing called "render_templates" and the render_template="generic:CONTOUR" (used to make the contours) conflicts with the render_template="generic:SPEC_GLOSS_FACTOR" (used in the desk_eagle_statue, desk_vase, faberge_egg and kaleidoscope) but also these render_template="generic:ALPHA_MASKED:EXTERNAL_ALPHA_REF:OPACITY_TEXTURE" (used in the desk_watch and jewelry_box) so those loot pickups will look worse period. Maybe the devs could make these render_templates to work without conflicting but i think it's something to do with the render pipeline of the Diesel Engine so i do not believe it will ever work.