Adjacent levels loaded with World Composition are ignoring Phys Materials

So we’re starting in this level

At the very moment we put a foot on any adjacent level like this one

We seem to loose all the Phys Materials Info of the Shared Layers as the footseps are falling back using the default sounds and spawning the default emitters

319425-physicalmaterials.png

I’m quite new to World Composition, is this some kind of bug? any help will be appreciated !