[Nodriver] Why does the number of browser.tabs remain unchanged after "Page" close?

[mashien0201]

browser = await uc.start()
page = await browser.get('url')
url2 = 'example.com'
#For special reasons, you need to use evaluate window.open to bypass Cloudflare
await page.evaluate(f'''window.open("{url2}", "_blank"); ''')
await page.close()

print(str(len(browser.tabs)))
#output len ​​2
page=browser.tabs[len(self.browser.tabs)-1]

In fact, the effect I want is to make the page become the last page of the browser when closing the current page.
But this doesn’t seem right, any suggestions?