About Fixing CAD Data with Exploded Surface


Hello, this is my first post on this forum.

I need to use CAD data in my Unreal Engine project. However some CAD files which was created in CATIA or NX and includes surfaces data, comes with problem. These files are coming to me in STEP or CGR file format. Then I use Cad Exchanger or Cad Assistant software to convert CAD data to FBX or Datasmith file formats.
BUT some surface parts of cad files seem exploded in 3ds Max (STEP or FBX file format) even they seem perfect in CATIA / NX.

I know this is not automatic process however I want to ask, is there any way to fix exploded surface? I have tried many modifiers and tools like ProOptimizer,Retopology,Smooth3D etc.
Is this repairing process possible in fully automatic way or how to fix in non-automatic way?

Thank you so much