PointsConfiguration not cleared even when there are no points in QScatterSeries

PointsConfirguration is not cleared in QScatterSeries even when there are no points in it.
This prevents pointsConfigurationChanged signal from being emitted when it should.

Steps to reproduce the bug -
Create a scatter series with 3 points -> Call size by method with arguments ([1,2,3], 10, 20) -> Notice that size of points changes -> Call clear method on the scatter series -> Again append 3 points to the scatter series -> Call the sizeBy method again with exactly same arguments -> Notice that sizes of points do not change this time.

Code example -

from PySide6.QtCharts import QChart, QChartView, QScatterSeries, QValueAxis, QXYSeries
from PySide6.QtWidgets import QMainWindow
from PySide6.QtCore import Qt

main_window = QMainWindow()
main_window.resize(500,500)
chart = QChart()
x_axis = QValueAxis()
x_axis.setRange(0,10)
chart.addAxis(x_axis, Qt.AlignBottom)
y_axis = QValueAxis()
y_axis.setRange(0, 10)
chart.addAxis(y_axis, Qt.AlignLeft)

chart_view = QChartView(chart, main_window)
main_window.setCentralWidget(chart_view)
scatter_series = QScatterSeries()
chart.addSeries(scatter_series)
scatter_series.attachAxis(x_axis)
scatter_series.attachAxis(y_axis)
main_window.show()

scatter_series.append(2.5, 2.5)
scatter_series.append(5, 5)
scatter_series.append(7.5, 7.5)
scatter_series.sizeBy([1, 2, 3], 10, 20)

(Notice size configuration is applied on points.)
Now, execute

scatter_series.clear()
scatter_series.append(2.5, 2.5)
scatter_series.append(5, 5)
scatter_series.append(7.5, 7.5)
scatter_series.sizeBy([1, 2, 3], 10, 20)

Notice that size configuration is not visibly applied to points this time.
Also,

print(len(scatter_series.pointsConfiguration())

can be used to verify that it prints 3 at all times (even after calling scatter_series.clear())