A_matrix in Linearize method has second derivate of q !

[kurosh-z]

I found the equations of Motion for a simple cart_pendulum using Kane's method. I have linearized the equations but in A Matrix there are second derivatives of q ! screenshots captured)
Hier is my code to linearize the equations : (It's actually like in the human_standing tutorial )
linearizer = Kane.to_linearizer()
op_point=[equilibrium_dict, parameter_dict]
linearizer.r=sm.Matrix(specified)
A, B= linearizer.linearize(op_point=op_point, A_and_B=True)

[asmeurer]

@sympy/mechanics