tq2qiskit returns same statevector before and after forward

[s110m]

Consider the following code:

# TorchQuantum to Qiskit

import torchquantum as tq
from torchquantum import QuantumDevice
from torchquantum.plugin.qiskit.qiskit_plugin import tq2qiskit
from qiskit.quantum_info import Statevector


class MyQNN(tq.QuantumModule):
    def __init__(self):
        super().__init__()
        self.u3_gate = tq.U3(has_params=True, trainable=True)
        self.cu3_gate = tq.CU3(has_params=True, trainable=True)

    def forward(self, q_device: QuantumDevice):
        self.u3_gate(q_device, wires=0)
        self.cu3_gate(q_device, wires=[0, 1])


def main():
    model = MyQNN()

    q_device = QuantumDevice(n_wires=2, bsz=1)
    print("Initial state:", q_device.get_states_1d())
    
    circ_1 = tq2qiskit(q_device, model)
    statevector_1 = Statevector(circ_1)
    print("Statevector from circ_1:", statevector_1)

    model(q_device)
    print("State after model forward:", q_device.get_states_1d())

    circ_2 = tq2qiskit(q_device, model)
    statevector_2 = Statevector(circ_2)
    print("Statevector from circ_2:", statevector_2)


if __name__ == "__main__":
    main()

The statevectors from circ_1 and circ_2 are identical. I don’t think they should be, because circ_2 is generated after the device state has changed. Am I correct, or is this a bug in the tq2qiskit function?