Geometry.parse() works but then calling normalize() causes exception

I have a simple path and want to normalize it so it’s centered. Here is the code where I create it and normalize it (the React StartIcon isn’t used in GoJS).

const paths = ['M6 4l20 12-20 12z'];

const StartIcon = props => (
  <SvgIcon viewBox="0 0 32 32" {...props}>
    {paths.map(path => <path d={path} />)}
  </SvgIcon>
);

export default StartIcon;

export const startGeometry = go.Geometry.parse(paths.join(' X '), true).normalize();

Here is the part of the template where I’m using it and ‘iconSource’ is the results of startGeometry.

        make(
          go.Panel,
          'Vertical',
          { margin: 3, cursor: 'move' },
          make(
            'Panel',
            'Viewbox',
            {
              name: 'templateIcon',
              background: 'rgba(255, 255, 255, 0)',
              alignment: go.Spot.Center,
              width: cfg.iconSize,
              height: cfg.iconSize
            },
            make(
              go.Shape,
              { background: 'red', width: cfg.pictureSize, height: cfg.pictureSize, stroke: null, fill: '#fff' },
              new go.Binding('geometry', 'iconSource')
            )
          )
        )

Doing this throws this exception.

go.js:1291 Uncaught TypeError: Cannot read property 'width' of undefined
    at X../node_modules/gojs/release/go.js.X.Ln (go.js:1291)
    at yk (go.js:1025)
    at C../node_modules/gojs/release/go.js.g.Ln (go.js:1172)
    at yk (go.js:1025)
    at C../node_modules/gojs/release/go.js.g.Ln (go.js:1147)
    at yk (go.js:1025)
    at C../node_modules/gojs/release/go.js.g.Ln (go.js:1155)
    at yk (go.js:1025)
    at C../node_modules/gojs/release/go.js.g.Ln (go.js:1159)
    at yk (go.js:1025)
    at T../node_modules/gojs/release/go.js.g.Ln (go.js:1159)
    at yk (go.js:1025)
    at D../node_modules/gojs/release/go.js.D.RB (go.js:793)
    at Hi (go.js:792)
    at Ri (go.js:789)
    at D../node_modules/gojs/release/go.js.D.maybeUpdate.D.cg (go.js:788)
    at go.js:788

If I remove the normalize() everything works just fine. Looking at the Geometry in Intro it doesn’t use width. Any ideas on what is going on? I’m using GoJS 1.8.14.

I tried this and same problem so my paths.join() isn’t causing the problem.

export const startGeometry = go.Geometry.parse('M6 4l20 12-20 12z', true).normalize();

PS - I’m using GoJS with NPM and if there’s a way to get the debug build let me know (if that stack trace will help).

Note that Geometry.normalize does not return a Geometry, but the offset it was translated: Geometry | GoJS API