Hey, I know I’m a bit late, but try changing (in the APEX export settings) the output unit to centimeters instead of meters. We noticed in the .xml files that correspond to the .apx files that are exported from the scene, the *ContactOffset *value was really, really low. Once we changed the output unit, the *ContactOffset *value became larger and we no longer saw the error in Unreal. My theory is that the export size was so small, that the engine interpreted the distance between vertices small enough to call them coincident.
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