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Having now diagnosed the problem rws reported, I think a good workaround is

sage: k2 = MF(h*k1.sage())
sage: k2
h^3*F^3*F2+h^2*F^2*F1+F


Basically, k1 is a Maxima element, not a Sage element, so you have to be careful putting it back with a Sage expression, like h.

Hopefully we can get #16592 fixed as well, of course.