[Python] Having white boundary when plotting a masked map, and then overlay the mask with grey...

So I am seeing a white boundary when plotting a masked map, and then overlay the mask with grey color:

def apply_mask(result_raster, mask):
return np.where(mask, np.nan, result_raster)

masked_result_raster = apply_mask(result_raster, mask)

flipped_mask = np.where(mask == 1, 0, 1)

plot_raster_with_colorbar(ax, masked_result_raster, cmap, norm, (bounds[0], bounds[2], bounds[1], bounds[3]), boundaries)

ax.imshow(flipped_mask, cmap=gray_cmap, alpha=0.6, extent=(bounds[0], bounds[2], bounds[1], bounds[3]))

plt.show()


How should I fix it?

I also tried directly plot the polygons which is the mask

polygons.plot(ax=ax, color='gray', edgecolor='none')


but still having white boundary

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