Bug in canonical_height for dynamical systems?

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Jun 6, 2023, 12:45:15 PM6/6/23

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The following few lines lead to a crash in Sage 10.0, with error message "TypeError: Not an element of the order." Is this an error on my part?

K.<a> = NumberField(3*x^2 + 1)
P.<z,w> = ProjectiveSpace(K, 1)
phi = DynamicalSystem_projective([a*(z^2 + w^2),z*w])
phi.canonical_height(P(a,1))