[BUG] Incorrect circuit diagrams for QNodes with loops and adjoints

[glassnotes]

What mode are you using in CircInspect?

• Real-time development
• Debugger mode

Expected behaviour

Entire sequence of operations generated by a loop is printed, for both regular operation and their adjoints.

Actual behaviour

The number of operations is incorrect adjoints are applied. It is usually about 2 loop iterations less, but this is irregular. For example, the image below is missing CNOTs from wires 3 and 4, and the terminal qml.adjoint(qml.QFT).

However, removing the adjoint results in the correct behaviour:

I tested also in PennyLane in a Jupyter notebook, and the adjoint version is drawn correctly.

Here's the code for testing:

import pennylane as qml
dev = qml.device("default.qubit", wires=7)

@qml.qnode(dev)
def my_circuit():

    for wire in range(5):
        qml.QFT(wires=range(5))
        qml.CNOT(wires=[wire, 6])
        #qml.adjoint(qml.QFT)(wires=range(5))

    return qml.probs()

# Execute a QNode to render a circuit in the righthand pane
my_circuit()

System information

• OS: Ubuntu 24.04
• Browser (include version): Mozilla Firefox 142.0.1