latex of elements of multivariate polynomial quotient ring

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Here is a block of code:

R = PolynomialRing(QQ, 'a, b, c')
a, b, c = R.gens()
I = R.ideal(a**2 + a + 1)
S = R.quotient(I, names=R.variable_names()).fraction_field()
a, b, c = S.gens()
show(a**2/b**3)  # this looks wrong
latex(a)  # = \text{\texttt{a}}, should just be `a`