Bug in nigthly version

Version 4.11.0
Expected behaviour: when using the slicer.util.plot in a python interpreter with more than 2 plots in the same graphic it shows a legend, that legend was changeable by plt.GetNthPlotSeriesNode(i).SetName(name_i) and all elements changed their name respectively.
Actual behaviour: only the last element change name and the rest take a default PlotSeries_i name regardless of the name I gave. This was not happening in 4.10.