found a new(?) bug, in scenes that only use static OR stationary lighting, skeletal meshes with SSS (substrate, skin profile) doesnt actually have SSS applied on them, but static meshes does work with SSS (currently using 5.4 with substrate on)
also this isnt related to substrate but i was wondering, does Distance Field Indirect Shadows work for anyone reading this? because for me and some people on my team (3 people who do actually use the project itself) DF indirect shadowing is completely broken and its buffer doesnt seem to follow the scale of the actual viewport scale unless the res is set to something like 110%