data missing when multiple parcoords traces

Originally reported in https://github.com/plotly/plotly.py/issues/1372

When multiple parcoords traces are placed in the same figure, the data lines only show up for the first trace. Subsequent traces display their axes, but no data lines.

CodePen: https://codepen.io/jonmmease/pen/xmqqJP

Code:

var fig = {
  "data": [
    {
      "dimensions": [
        {
          "constraintrange": [
            1,
            2
          ],
          "label": "A",
          "range": [
            1,
            5
          ],
          "values": [
            1,
            4
          ]
        },
        {
          "label": "B",
          "range": [
            1.5,
            5
          ],
          "tickvals": [
            1.5,
            3,
            4.5
          ],
          "values": [
            3,
            1.5
          ]
        }
      ],
      "domain": {
        "x": [
          0,
          0.45
        ],
        "y": [
          0,
          1
        ]
      },
      "line": {
        "color": "blue"
      },
      "type": "parcoords"
    },
    {
      "dimensions": [
        {
          "constraintrange": [
            1,
            2
          ],
          "label": "C",
          "range": [
            1,
            5
          ],
          "values": [
            1,
            4
          ]
        },
        {
          "label": "D",
          "range": [
            1.5,
            5
          ],
          "tickvals": [
            1.5,
            3,
            4.5
          ],
          "values": [
            3,
            1.5
          ]
        }
      ],
      "domain": {
        "x": [
          0.55,
          1
        ],
        "y": [
          0,
          1
        ]
      },
      "line": {
        "color": "blue"
      },
      "type": "parcoords"
    }
  ],
  "layout": {
    "title": "Multi-Parcoords Diagram"
  }
}

Plotly.plot('plotly-div', fig);

This worked fine in 1.31.0, seems to have broken in 1.32.0, and remains broken in 1.33.0.

[archmoj]

This is the result of this commit: https://github.com/plotly/plotly.js/pull/2159/commits/e6fcbf51de4b41db470b7194835b20f57f06098f

[tzhang-lilly]

Hi, I think the bug is not related to the constraints on the graph. I had the same issue with the stackoverflow post. With multiple subplots, only the first graph would show up…