Unreal "fixing" overlapping vertices that I dont want to be merged

Development Asset Creation
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Hi,
I have a object(mesh) made in blender with shape keys that splits my mesh like an explosion. So my mesh have separated faces in it, but when importing the mesh to unreal engine 5.5 the verts have been merged(since they are separated for a reason I don’t get why they forcing the “fixing”).
So when i use my blend shape that is suppose to look like an explosion it now look like the mesh is deforming (the holes are not showing since its been “stitched”)

Tried everything I can think off, turned off LOD generate, no nanite.

How can I stop Unreal from “fixing” meshes that i import?

Thanks in advance.

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Been a year since I opened unreal, so I might not know the right lingo, but IIRC there’s an import option called “remove degenerates” or similar.
think you can also enable that in the mesh viewer, but not sure.

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