PyAutoGUI截图结合多进程仅首次运行正常问题排查求助

我无法定位代码错误，已经尝试重写代码、重装Python、相关模块及PyCharm，但问题仍未解决。

代码背景与问题说明 #

我正在编写一款单人游戏挂机脚本，通过PyAutoGUI的screenshot()函数截图并识别特定颜色，判断是否可开始游戏。若满足启动条件，则通过multiprocessing模块启动自动点击函数，等待游戏时长后终止进程，随后循环检查是否可再次启动游戏（每5分钟可启动一次）。

脚本初始运行正常，但存在核心问题：首次截图触发自动点击后，当游戏结束回到循环开头时，截图代码停止工作——不再重新截图，而是复用之前触发自动点击的旧截图，导致误判并立即再次启动自动点击。

代码展示 #

import pyautogui as pg
import multiprocessing as mp
import time

def launchAutoclicker(): # I don't think the problem is in this function but here it is anyway
    while True:
        screenshot = pg.screenshot(region=(sceneScreenshotCornerX, sceneScreenshotCornerY, sceneScreenshotWidth, sceneScreenshotHeight))
        for y in range(topBorderToToilet, sceneScreenshotHeight, toiletToToiletY): # 3 rows
            for x in range(leftBorderToToilet, sceneScreenshotWidth, toiletToToiletX): # 5 columns
                if screenshot.getpixel((x,y))[0] > 200:
                    pg.click(x + sceneScreenshotCornerX,y + sceneScreenshotCornerY)

def main():
    while True:
        screenshot = pg.screenshot(region=(startScreenshotCornerX, startScreenshotCornerY, 50, 1)) # This is the line that stops working
        for startX in range(0, 50):
            if screenshot.getpixel((startX, 0))[2] > 200: # This checks the screenshot colors
                del screenshot # EXPLAINING OF THIS DEL BELOW
                clickerProcess = mp.Process(target=launchAutoclicker)
                clickerProcess.start()
                pg.click(700, 1000) # This clicks the start button
                time.sleep(gameplaySeconds + 5) # Here the code sleeps for the duration of the game
                clickerProcess.kill()
        time.sleep(1)

if __name__ == '__main__':
    main()

关于del screenshot的说明 #

我在PyCharm中添加该语句尝试清空变量（已无计可施），但PyCharm在main函数的截图行提示警告：Local variable "screenshot" might be referenced before assignment。

恳请各位帮忙排查问题！

内容的提问来源于stack exchange，提问作者TripleCreeper3