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answered 2024-06-16 14:00:54 +0100
A workaround is to define the second ring as multivariate, that is, PolynomialRing(QQ, 1, 'y') instead of PolynomialRing(QQ, 'y').
PolynomialRing(QQ, 1, 'y')
PolynomialRing(QQ, 'y')