Grapesjs Block got resetted everytime i change class

Question

I'm trying to create a custom plugin for GrapesJS but I'm having some issues with it. This plugin will add custom block with type bootstrapIcon, when i double click the component icon picker modal will show up then i can choose what icon i want.

The issues is everytime i change icon, value like font-size, color got resetted.

You can try here on demo link: Demo

setTimeout(function () {
  window.editor = grapesjs.init({
    height: "100%",
    noticeOnUnload: false,
    storageManager: true,
    container: "#gjs",
    fromElement: true,
    plugins: ["gjs-bootstrap-icon"],
    pluginsOpts: {
      "gjs-bootstrap-icon": {
        label: "Icon",
        category: "Bootstrap"
      }
    }
  });
}, 100);

I am expecting block value from style manager will store somewhere.