Question: bug in Eigenvectors

I believe I've found a bug, where Eigenvectors returns two eigenvectors which are the same (even though the eigenvalues are different). The expressions involves RootOf's, and it seems that the eigenvalues use "index" to distinguish themselves, yet the eigenvectors do not.


x := RootOf(z^2-t, z);
m := Matrix(2, (i,j) -> evala(add(a[j, k]*((-1)^(i-1))^k*x^k, k = 0..1)));
ev := Eigenvectors(m);

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