Does anybody have any idea how the following could happen?

(c is an element of R = InfinitePolynomialRing(QQ, "FESDUMMY"), and I set P 
= R.polynomial_ring())

Martin

ipdb> p c.polynomial().parent()
Multivariate Polynomial Ring in FESDUMMY_1, FESDUMMY_0 over Rational Field
ipdb> p R
Multivariate Polynomial Ring in FESDUMMY_1, FESDUMMY_0 over Rational Field
ipdb> p c.polynomial().parent() is R
False
ipdb> p R(c.polynomial()).parent() is R
True

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