Disappearing top panel when using PanelExpanderButton

GoJS
8

I’d like to know why, when you are doing new development, you cannot update your dependencies.

const $ = go.GraphObject.make;

const roundedRectangleParams = {
  parameter1: 2, // set the rounded corner
  spot1: go.Spot.TopLeft,
  spot2: go.Spot.BottomRight, // make content
};

myDiagram.nodeTemplate =
  $(go.Node, 'Auto', {
      resizable: true,
      locationSpot: go.Spot.Top,
      selectionAdornmentTemplate:
        $(go.Adornment, 'Auto',
          $(go.Shape, 'RoundedRectangle', {
              fill: null,
              stroke: '#7986cb',
              strokeWidth: 3,
            },
            roundedRectangleParams),
          new go.Placeholder()
        ) // end Adornment
    },
    new go.Binding('desiredSize', 'size', go.Size.parse).makeTwoWay(go.Size.stringify),
    $(go.Shape, 'RoundedRectangle', {
        parameter1: 2,
        fill: 'white',
        stroke: 'gray',
        strokeWidth: 5,
      },
      roundedRectangleParams),
    $(go.Panel, 'Table', { stretch: go.GraphObject.Fill, margin: 2 },
      $(go.Panel, 'Auto', { row: 0, stretch: go.GraphObject.Fill },
        $(go.Shape, 'RoundedRectangle', { fill: 'red', strokeWidth: 0 },
          roundedRectangleParams,
          new go.Binding('fill', 'color')),
        $(go.Panel, 'Horizontal', { margin: 4 },
          $(go.TextBlock, {
              editable: true,
              overflow: go.TextBlock.OverflowEllipsis,
              font: 'bold 14px sans-serif',
              text: 'node name',
              alignment: go.Spot.Left,
              margin: 2,
            },
            new go.Binding('text').makeTwoWay()),
          $('PanelExpanderButton', {
            background: 'white',
            alignment: go.Spot.Right,
          })
        )
      ),
      $(go.Panel, 'Vertical', {
          row: 1,
          name: 'COLLAPSIBLE',
          visible: false,
          margin: 8,
          defaultAlignment: go.Spot.Left
        },
        $(go.TextBlock, 'additional information 1'),
        $(go.TextBlock, 'additional information 2')
      )
    )
  );