This [pen](https://codepen.io/Nauss/pen/bGxWYjK) is simply the [basic heatmap example](https://plotly.com/javascript/heatmaps/#basic-heatmap) with the `showticklabels` option set to false. ``` javascript colorbar: { showticklabels: false } ``` If I comment the option or set it to true it works correctly. Looks like a bug or am I missing something ?