python-requests-html render inconsistent result

background:
by default the website is only showing few names and there s a "moreBtn" to generate the full list

code idea:
create Html session, render with script clicking the "moreBtn", parse and extract the html data with beautifulsoup

problem:
apparently the code only work once a while. dont see any error and response status is still 200 but no more interaction after clicking "moreBtn"

questions:
based on the behaviour it looks like the server blocked the interaction but i dont see message or error of getting blocked to access the website(it works fine if I open a real browser), I tried to catch some denied / blocked but fail to capture anything

1. what is wrong here and any advise how to check if something is blocked?

2. I know playwright or selenium will do the job but why "requests-html" fails to render consistently?

thank you so much

import requests
from bs4 import BeautifulSoup
from requests_html import HTMLSession

url = "https://www.yuantaetfs.com/tradeInfo/pcf/0050"

def get_ETFPCF_yuanta_2():
    try:
        session = HTMLSession()
        response = session.get(url)

        print(response.status_code)
        script = """
        document.querySelector('div.moreBtn').click()
        """
        response.html.render(sleep=8,wait=8, script=script, timeout=8, keep_page=True)
        
        # Parse HTML content
        soup = BeautifulSoup(response.html.html, 'html.parser')

        response.html.session.close()
        # Find the table body (tbody)
        tbody = soup.find('div', class_='tbody')

        if tbody:
            # Extract all rows from the table body
            rows = tbody.find_all('div', class_='tr')

            # Process each row
            for row in rows:
                # Extract all cells (td or th elements)
                cells = row.find_all('div', class_='td')
                row_data = [cell.find('span', class_='').text for cell in cells]
                print(row_data)
        else:
            print("No tbody element found on the page.")

    except Exception as e:
        print(f"An error occurred: {e}")

if __name__ == '__main__':
    get_ETFPCF_yuanta_2()