I'm experiencing a content duplication issue in my collaborative editor built with Yjs and PartyKit. Every time I refresh the page, the initial content is duplicated.​

Steps to Reproduce:

Set up a collaborative editor using Yjs and PartyKit.​

• Insert initial content into the Yjs document if it's empty.​

• Open the editor in a browser.​

• Refresh the page.​

• Observe that the initial content is duplicated.​

Expected Behavior:

The initial content should appear only once, regardless of page refreshes.​

Actual Behavior:

Each page refresh results in the initial content being duplicated.​

Code Snippet:

import type { PartyKitServer } from "partykit/server";
import { onConnect } from "y-partykit";
import * as Y from "yjs";

export default {
  onConnect(ws, room) {
    return onConnect(ws, room, {
      persist: { mode: "snapshot" },

      async load() {
        const yDoc = new Y.Doc();
        return yDoc;
      },
    });
  },
} satisfies PartyKitServer;

This happens as soon I goes away from blocknote editor to some other page when I comes back the initial lines repeats.