Selenium操作动态表格首行元素报错问题求助

我在处理网页动态生成的表格交互时遇到问题，编写了以下Python Selenium代码用于定位表格并操作首行：

def find_table(browser:object, th:int, header:str, select_first=False, double_click_first=False):

    for index, head in enumerate(browser.find_elements(By.XPATH, f"//th[{th}]")):
        print(head.text)
        if head.text == header: break
    
    print(index)
    
    tables = browser.find_elements(By.XPATH, "//table")
    print(len(tables))
    
    main_table = tables[index]
    test = main_table.find_element(By.XPATH, ".//tr[1]/td[3]").text
    print(test)
    
    if select_first == True:
        main_table.find_element(By.XPATH, f".//tr[1]/td[{th}]").click()

    if double_click_first == True:
        first_row = main_table.find_element(By.XPATH, f".//tr[1]/td[{th}]")
        action = ActionChains(browser)
        action.double_click(first_row).perform()

第一个表格（XPath路径：

/html/body/div[2]/div/div[1]/form[2]/div/div/div/div/div/div/div/div[2]/div[3]/div/div/div/table/tbody/tr[1]/td[4]

）能正常工作，但第二个表格（XPath路径：

/html/body/div[4]/div/div/div/div/div[2]/div/div/div/div[2]/div/div/div/div/div/div[17]/div/div/div[4]/div/div/div/div/div/div[2]/div[3]/div/div/table/tbody/tr[1]/td[3]

）抛出异常：

selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":".//tr[1]/td[3]"}

奇怪的是，打印信息显示表头文本、索引、表格总数均正确。

内容的提问来源于stack exchange，提问作者dukbiw