STL Corruption

I am having problems important a number of STL files I have generated. They are manifold, although FreeCad does say they have 'folds on surface'. This should not actually interfere with the import, and the folds do not appear to be related in any case. The files are located here: https://drive.google.com/drive/folders/1u5gHAMfQP4LQZ2_rP2H9U-iWAaa4Ua7m?usp=sharing

gen5-forward-4020-left.stl is the original model, and Fantastic Kup.stl is what Tinkercad does to it


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