Looks like a Singular error, the first Hilbert series and second Hilbert
series returned are not consistent:
{{{
sage: gb = I.groebner_basis()
sage: h1=hilb(gb,1)
// ** _ is no standard basis
sage: h2=hilb(gb,2)
// ** _ is no standard basis
sage: Zt=ZZ['t']
sage: f1=Zt(list(h1));f1.degree()
33
sage: f2=Zt(list(h2));f2.degree()
3
sage: f1-(1-t)**30*f2
4294967296*t^22 - 4294967296*t^21 + 4294967296*t^20 - 4294967296*t^19 +
4294967296*t^18
}}}
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