QtQuick: SignalSpy connected to a QAbstractItemModel::dataChanged() does not store all arguments of the signal

In my unit test I connnect a QML SignalSpy to a QAbstractItemModel::dataChanged() signal.

According to the Qt documentation this signal has 3 arguments:

In my application the third argument "roles" should contain exactly one entry (a custom role with value 256). I need to verify this.

But SignalSpy reports only 2 arguments of the received signal: topLeft and topRight (which are both correct in my unit test).

console.log(spy.signalArguments[0].length) tells "2" and

console.log(spy.signalArguments[0][2]) tells "undefined".

Expected behavior:

SignalSpy stores ALL arguments of the connected signal in its signalArguments list.

In my case spy.signalArguments[i].length should be 3 for all received dataChanged() signals and spy.signalArguments[i][2] is a list of int which may be empty.{}