Won't extract the title of page in browser beside first time

[SettingDust]

• Platform: Browser
• Mercury Parser Version: 2.2.1
• Browser Version (if a browser bug): Firefox Developer 93.0b6

Expected Behavior

Parse the page and extract title

Current Behavior

The title won't extract as title say

Steps to Reproduce

A tampermonkey script for testing

window.onload = () => {
  setInterval(() => Mercury.parse().then(result => console.log(`[Test] ${result.title}`)), 5000)
}

Detailed Description

The outputs

Possible Solution

Sorry, It's too deep for me. :(