[BUG]: scattergl error bars visibility mismatch

[JulienIcon]

Description

There is a synchronization bug when using scattergl traces with error bars (error_y or error_x) mixed with traces without error bars. When toggling the visibility of a trace via the legend, the line disappears correctly, but its error bars remain visible (ghosting), or the error bars of a different trace disappear instead.
This issue does not occur when using standard scatter (SVG) traces.

Screenshots/Video

You can see the bug in action here :

Screencast.From.2026-04-24.11-55-44.mp4

Steps to reproduce

Here https://codepen.io/JulienIcon/pen/emdwbZj try to click on "my", "my" curve with disappear, but it's error bars remain visible, and the error bar of "mz" disappear.
Or :

1. Create a plot.
2. Add multiple scattergl traces, some of them having error_y enabled.
3. Click on a trace in the first legend to hide it (e.g., the 5th trace).

Notes

It seems that when all traces have error_y enabled, there is no synchronization bug

[camdecoster]

Thanks for the report! This sure looks like a bug. Our team probably won't be able to get to it any time soon, but we can prioritize a PR review if you want to take a look. For reference, here's the code from the reproduction Codepen that targets a div with the id "myDiv":

const payload = {
    "data": [
        {
            "type": "scattergl",
            "mode": "lines",
            "name": "my",
            "x": [
                0,
                1,
                2,
                3,
                4
            ],
            "y": [
                1,
                2,
                1,
                2,
                1
            ],
            "error_y": {
                "type": "data",
                "array": [
                    0.1,
                    0.1,
                    0.1,
                    0.1,
                    0.1
                ],
                "visible": true
            },
            "visible": true
        },
        {
            "type": "scattergl",
            "mode": "lines",
            "name": "mz",
            "x": [
                0,
                1,
                2,
                3,
                4
            ],
            "y": [
                2,
                3,
                2,
                3,
                2
            ],
            "error_y": {
                "type": "data",
                "array": [
                    0.1,
                    0.1,
                    0.1,
                    0.1,
                    0.1
                ],
                "visible": true
            },
            "visible": true
        },
        {
            "type": "scattergl",
            "mode": "lines",
            "name": "X",
            "x": [
                0,
                1,
                2,
                3,
                4
            ],
            "y": [
                1.2,
                2.2,
                1.2,
                2.2,
                1.2
            ],
            "visible": true
        },
        {
            "type": "scattergl",
            "mode": "lines",
            "name": "Y",
            "x": [
                0,
                1,
                2,
                3,
                4
            ],
            "y": [
                2.2,
                3.2,
                2.2,
                3.2,
                2.2
            ],
            "visible": true
        }
    ],
    "layout": {
        "dragmode": "zoom",
        "title": {
            "text": "My title"
        },
        "xaxis": {
            "type": "linear",
            "autorange": true,
            "title": {
                "text": "my X"
            },
            "showline": true,
            "tickmode": "auto",
            "nticks": 30,
            "tickcolor": "#000",
            "zeroline": false,
            "minor": {
                "tickmode": "auto",
                "nticks": 8,
                "tickcolor": "#aaa"
            }
        },
        "yaxis": {
            "type": "linear",
            "autorange": true,
            "title": {
                "text": "My Y"
            },
            "showline": true,
            "exponentformat": "e",
            "showexponent": "all",
            "tickmode": "auto",
            "nticks": 20,
            "tickcolor": "#000",
            "zeroline": false,
            "minor": {
                "tickmode": "auto",
                "nticks": 4,
                "tickcolor": "#aaa"
            }
        }
    },
    "config": {
        "editable": false,
        "scrollZoom": true,
        "doubleClick": "autosize",
        "displayModeBar": false,
        "displaylogo": false
    }
};

Plotly.newPlot('myDiv', payload.data, payload.layout, payload.config);