Unexpected behavior in lines containing NaN datapoints when zooming

If I have a single line plotted which also has a few np.nan's at certain data points, everything looks fine when the graph is constructed with gaps appearing where the np.nan's are located. But when using zoom tools strange lines appear at the left-most np.nan position:

The cyan and orange lines above have np.nan values to create the gaps, otherwise there are only two lines on the plot.