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LaurentPolynomialRing ideal not reducing


sage: XX.<x> = LaurentPolynomialRing(QQ)                                                                                                                      
sage: YY.<xbar> = XX.quotient(XX.ideal(x**2))                                                                                                                 
sage: xbar**3                                                                                                                                                 

Which is not zero, unlike if you replace Laurent polynomial with plain polynomial ring. I don't know how to reduce this vs. the defining ideal. Is there a way to do it currently in Sage, or is there something wrong with the expectation?