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This was a bug which has been fixed in the meantime.

This was a bug which has been bug, fixed in the meantime.meantime at

(merged in Sage 9.3.beta9).

This was a bug, fixed in the meantime at

(merged in Sage 9.3.beta9).9.3.beta9). In Sage 9.3.rc2 for instance:

sage: A.<t> = QQ[]
sage: B.<x, y> = QQ[]
sage: H = B.quotient(B.ideal([B.1]))
sage: f = A.hom([H.0], H)

sage: f
Ring morphism:
  From: Univariate Polynomial Ring in t over Rational Field
  To:   Quotient of Multivariate Polynomial Ring in x, y
        over Rational Field by the ideal (y)
  Defn: t |--> xbar

sage: f.kernel()
Principal ideal (0) of Univariate Polynomial Ring in t over Rational Field