BUG: AssetManager events not working

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Chrome

Reproducible demo link

NA

Describe the bug

AssetManager events are not fired. The file gets uploaded correctly but events are not notified:

     // Asset Event Listners

    editor.on('asset:upload:start', () => {
      // The upload is started
      console.log('Upload started');
    });

    editor.on('asset:upload:end', () => {
      // The upload is ended (completed or not)
      console.log('Upload ended');
    });

    editor.on('asset:upload:error', (err) => {
      // Error handling
    });

    editor.on('asset:upload:response', (response) => {
      // Do something on response
      console.log(response);
    });

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