[Python] Incorrect PieceWise result of integration in Sympy

Result of integrating a function

x,z = symbols('x z', real=True); x,z
px,pz = symbols('p_x p_z'); px,pz
xxe = exp( pz*z + px*x ); xxe
xxe.integrate(z)


in second case of PieceWise doesn't include the multiplier ( exp(px*x) )



In the first case, PieceWise contains it; in the second, it does not. Why?

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