Bug in legend_label of list_plot?

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Hi, Suppose lstR and lstS are two lists of real numbers.

X = list_plot(lstR, plotjoined = True, color='black', marker = 'o', linestyle="-", legend_label='$R$', axes_labels=['Trial number', 'Value'])
Y = list_plot(lstS, plotjoined = True, color='black', marker = 's', linestyle="--", legend_label='$S$', axes_labels=['Trial number', 'Value'])      
(X+Y).show()

The legend label for R is two squares joined by a line instead of two circles joined by a line. Is this a bug? (I am unable to upload the plot image because my karma is not > 60.)