Issues when using negative data on bar graphs

[xarico10]

When using negative data on a stacked bar graph, some problems are happening.

x = [1980 1990 2000];
y = [15 20 -5; 10 -17 21; -10 5 15];
bar(x,y,'stacked')

fig2plotly();

Expected and generated (https://chart-studio.plotly.com/~xarico10/559/#/) plots:

As seen, there are many problems: On the first bar, no negative data is being plotted. On the second one, seems like if only one series is being plotted (and not reaching the correct value). On the third one only two series are being plotted.

Examples on using negative data can be found on:
https://www.mathworks.com/help/matlab/ref/bar.html#mw_4e8dc5f0-041d-417b-b88e-adf416d47558