I try with this MIMO system, the function broke at line 614. The step_info function convert the system to SIMO, but cannot calculate the step response characteristic parameters.

from control import ss step_response step_info

A = [[0.68, -0.34], [0.34, 0.68]];
B = [[0.18, -0.05], [0.04, 0.11]];
C = [[0, -1.53], [-1.12, -1.10]];
D = [[0, 0], [0.06, -0.37]];
m_sys = ss(A,B,C,D,0.2);
mt,my=step_response(m_sys)

step_info(m_sys)

File ".../timeresp.py", line 614, in step_info
if((yout[i] <= inf_margin) | (yout[i] >= sup_margin)):

IndexError: index 24 is out of bounds for axis 0 with size 2