Default 'filled' argument not working correctly

[xarico10]

On different types of scatter plots, when the input argument 'filled' is missing, the markers are supposed to be empty, with no fill color. However, this doesn't happen and there's no way to let markers have no fill.

For example:

rng(1)

x = linspace(0,3*pi,200);
y = cos(x) + rand(1,200);
c = linspace(1,30,length(x));
scatter(x,y,[],c)

fig2plotly();

The previous code correctly colors the outside marker's line (zooming in will help to verify it), however, as it fills the markers with a default blue color, the color variation isn't very perceptible. And there's no way to get rid of that default filled characteristic.

Expected and generated (https://chart-studio.plotly.com/~xarico10/301/#/) plots:

Examples on how to use the 'filled' input argument can be found on:
https://www.mathworks.com/help/matlab/ref/scatter.html#btrli6p-1