BUG: Duplicated CSS while multi page creation

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Chrome latest

Reproducible demo link

https://codesandbox.io/s/withered-bush-wv29dx?file=/index.js

Describe the bug

How to reproduce the bug?

1. ... create multi pages in grapesjs.init()
2. ... check the styles of each page

What is the expected behavior? every page contains there own style not include the CSS of other pages ...

What is the current behavior? currently the CSS of all pages will merged and apply on all pages. for more details visit the reproduction link and check the code of all pages ...

If is necessary to execute some code in order to reproduce the bug, paste it here below:

// simple code for demonstration 
import grapesjs from "grapesjs";
import "grapesjs-blocks-basic";

const paperCode = [
  {
    css: "p{color:red}",
    html: "<p>first page</p>"
  },
  {
    css: "p{color:blue}",
    html: "<p>second page</p>"
  },
  {
    css: "p{color:green}",
    html: "<p>third page</p>"
  }
];

const editor = grapesjs.init({
  container: "#gjs",
  fromElement: 1,
  storageManager: { type: 0 },
  plugins: ["gjs-blocks-basic"],
  pageManager: {
    pages: paperCode.map((page, index) => {
      return {
        name: `page ${index + 1}`,
        id: `${index + 1}`,
        styles: page.css,
        component: page.html
      };
    })
  }
});

editor.Pages.select("1"); // in order to see other pages, change the value from 1 to 3. eg, "1", "2", "3"

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