Impossible to select black #000000 with the color picker

[MarineLohezic]

Expected behaviour

Be able to select 100% black (#000000)

Actual behaviour

When I select the black with the color picker it dosen't work, in the input on the color picker we can read #0 instead of #000000.
The color shown stile the same, it's not black.

Reproduction steps

Add black color to available colors :
highed.meta.colors.push('#000000');

try to add a new color in simple -> appearance by using the color picker.
Try to select the black color.

Editor version

Highcharts JS v8.0.0 (2019-12-10)

Affected browser(s)

Chrome, firefox on windows and macOs