let code = Math.floor(Math.random() * 16777215).toString(16);
            if (code === "000000" || code === "ac132") {
                code = Math.floor(Math.random() * 16777215).toString(16);
            }
            let colored = '#' + code;

            let dataset = {
                label: value.name,
                name: value.urls.name,
                color: colored,
                stickyTracking: true,
                showInNavigator: true,
                visible: true,
                data: value.values,
                dataGrouping: {
                    enabled: false,
                }

            };

And also the legend gets weird with black, covers the whole space and does not show other series properly, it only happens with black colors and its combinations.

I am using Highstock JS v9.2.2 (2021-08-24)

Here is the fiddle with one sample color code Fiddle link