My static mesh has nanite enabled. So if i try to merge it with another static mesh the result is totaly broken geometry. Even if i try to re-save the mesh alone, it looks like it went back to something from 1990’s game geometry. So thats even way worse then just to have nanite disabled/not apply to it, but it must be something else. BTW nanite is enabled all the time. Here an example how it looks befor i save it
and here it is after i save it side by side 
So any idea what can cause this ? It even break some of my other stuff i created that was priviously saved and had perfect geometry but now it turned broken as well and the work i done is ruined. I have dx 12 api set as default…