Mathematica misinterprets some underscored symbolic variables

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Following examples show that the interface between sage and Mathematica misinterprets symbolic variables if they are underscored with numbers:

sage: h_20,h_10,h_2,h_3,h20,h10,h_ij,h_kl=var("h_20,h_10,h_2,h_3,h20,h10,h_ij,h_kl");
sage: mexpr=mathematica((h_20+h_10)^3);
sage: print(mexpr);
                3
     27000 (h_)
sage: mexpr1=mathematica((h20+h10)^3);
sage: print(mexpr1);
                3
     (h10 + h20)
sage: mexpr2=mathematica((h_2+h_3)^3);
sage: print(mexpr2);
             3
     125 (h_)
sage: mexpr3=mathematica((h_ij+h_kl)^3);
sage: print(mexpr3);
                      3
     ((h_ij) + (h_kl))

I use sage-8.1 and Mathematica 11.2.0 at Linux OpenSUSE Leap v42.3. In this forum I haven't found any other comment regarding this funny behaviour.