Uncaught TypeError: this._meta.byKey is not a function

[lastmjs]

On a fresh install of wysiwyg-e:

Uncaught TypeError: this._meta.byKey is not a function
    at HTMLElement._updateIcon (iron-icon.js:164)
    at HTMLElement._iconChanged (iron-icon.js:145)
    at Object.runMethodEffect [as fn] (property-effects.js:769)
    at runEffectsForProperty (property-effects.js:153)
    at runEffects (property-effects.js:121)
    at HTMLElement._propertiesChanged (property-effects.js:1617)
    at HTMLElement._flushProperties (properties-changed.js:340)
    at HTMLElement._flushProperties (property-effects.js:1471)
    at HTMLElement.ready (property-effects.js:1571)
    at HTMLElement.ready (element-mixin.js:532)

[lastmjs]

It looks like this is an issue with iron-icon, see here: PolymerElements/iron-icon#122

I am able to get around it by manually importing @polymer/iron-meta before wysiwyg-e.