ACS自动化登录脚本异常：第二次登录部分注入代码执行被跳过求助

这是针对Access Client Solutions（ACS）的自动化应用，Python脚本运行时无故跳过部分代码。

关于ACS登录，需进行两次验证尝试：首次登录代码执行正常，但第二次登录时，ky.send_keys(username)和ky.send_keys(password)这两行注入代码被跳过，而{TAB}和{ENTER}命令可正常执行。值得注意的是，该双登录功能此前在SIT环境中可正常运行，且两次登录的代码逻辑完全一致，目前无法明确代码被跳过的原因。

print("Injection Starting")
try:
    ky.send_keys(username)
    time.sleep(2)
    ky.send_keys("{TAB}") 
    ky.send_keys(password)
    time.sleep(2)
    ky.send_keys("{ENTER}")
except Exception as e:
    print(f"Error during first injection: {str(e)}") #f-string with expression with {}.

print("Second Injection Starting")
try:
    ky.send_keys(username)    #somehow this is being skipped.
    time.sleep(3)
    ky.send_keys("{TAB}")     #but this part it worked.
    ky.send_keys(password)    #again, this is being skipped.
    time.sleep(3)
    ky.send_keys("{ENTER}")   #and this part it worked.
    time.sleep(3)
except Exception as e:
    print(f"Error during second injection: {str(e)}")

请问有人遇到过此类问题吗？我接下来打算尝试替换为pyautogui，但对其有效性存疑，十分费解。

感谢！

内容的提问来源于stack exchange，提问作者GrootLuie