Mirrored mesh components do not collide

Hi there, I have a composite mesh actor that consists of multiple components derived off UStaticMeshComponent… Some of them are “cleverly” modeled so that they can be reused on symmetrical meshes simply by mirroring them (scaling them to -1 on certain axes).
However, only the original unscaled mesh component seems to collide on impact, the rest just falls through massive objects. Any ideas, anyone?

Update: When I add a simple box collision to the mesh it does collide, although my project requires convex collisions as well as imported collision meshes (export objects from blender with UCX_* prefix)…

I had the same issue. As a short term fix, I deleted all collisions, then in the settings make sure collision complexity is set to Project Default and there’s nothing in the Simple Collision Physical Material slot. Then apply an Auto Convex Collision. This worked for me.