Resetting a QComboBox custom model doesn't emit currentIndexChanged or currentTextChanged

If a QComboBox has a currentIndex >= 0, then calling QComboBox.clear() will cause currentIndexChanged and currentTextChanged to be emitted since the currentIndex will be changed to -1. However, these signals are not emitted when clearing a custom model attached to a combo box. For example (using PySide):

from PySide6 import QtWidgets, QtCore
app = QtWidgets.QApplication([])
combo = QtWidgets.QComboBox()
combo.addItems(["a", "b", "c"])
combo.setCurrentIndex(1)

def on_current_index_changed(new_index):
    print(f"current index changed: {new_index}")

combo.currentIndexChanged.connect(on_current_index_changed)
combo.clear()

will print "current index changed: -1" to standard out, but

from PySide6 import QtWidgets, QtCore
app = QtWidgets.QApplication([])
combo = QtWidgets.QComboBox()
model = QtCore.QStringListModel()
combo.setModel(model)
model.setStringList(["a", "b", "c"])
combo.setCurrentIndex(1)

def on_current_index_changed(new_index):
    print(f"current index changed: {new_index}")

combo.currentIndexChanged.connect(on_current_index_changed)
model.setStringList([])

won't print anything. The same issue occurs when using currentTextChanged in place of currentIndexChanged. I see this behavior using Qt 6.3 as well as 6.2.2. (For Qt 6.3, PySide6.__version__, QtCore.__version__, and QtCore.qVersion() are all '6.3.0'. For Qt 6.2.2, PySide6.__version__ is '6.2.2.1', and QtCore.__version__ and QtCore.qVersion() are both '6.2.2'.) I've also seen the same behavior using PyQt with Qt 6.2.1, and I suspect the issue would occur in C++ as well. I don't see this behavior using PyQt with Qt 5.12. In that case, both scripts print out "current index changed: -1". I suspect the issue was introduced in QTBUG-80998. In Qt 5.12, QComboBoxPrivate::_q_modelReset had an explicit check to emit currentIndexChanged, but the current implementation relies on trySetValidIndex to emit currentIndexChanged, and it appears that method won't emit the signal if count() == 0 and currentIndex() == -1 since it can't set a valid index.