Selenium cannot find session (NOT Duplicate)

First off,let me start by stating that I have researched this matter thoroughly and I am struggling to find the reasoning behind this error.

I am running Selenium in Google App Engine, in a Flask service & I always get an "invalid session id" error. Here is how I initialize the driver :

import chromedriver_binary

# User agent for desktop
user_agent = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.81 Safari/537.36'

options = Options()

# specify headless mode
options.add_argument('--headless')

options.add_argument(f'user-agent={user_agent}')

options.add_argument("--window-size=1920,1080")

options.add_argument("--disable-gpu")
options.add_argument("--no-sandbox")
options.add_argument('--disable-blink-features=AutomationControlled')
options.add_experimental_option("excludeSwitches", ["enable-automation"])
options.add_experimental_option('useAutomationExtension', False)

options.add_argument('--disable-dev-shm-usage')     

wd = webdriver.Chrome(options=options)

And then this is the snippet that is problematic:

@app.route("/scrape-stuff")

def scrape_stuff():
    
    try:
        wd.get(".....")
        time.sleep(3)
    except Exception as e:
        send_sms("Critical error")
        sys.stdout.write("Critical error" + str(e))

    # this array holds the result of the scrape
    result_array=[]
    # accept cookies button
    try:
        wd.execute_script('...').click())
    except:
        pass



    for i in range(1,2):

  
        
    #     Select from the dropdown 
        try:
            wd.execute_script(f"document.querySelector('....').click()")
            time.sleep(2)
        except Exception as e:
            send_sms("Critical error: cannot select from dropdown"+str(e))
            sys.stdout.write("ERROR")
        
        
    #     Press all Load more -until there is nothing left 
        view_more_button=1
        while view_more_button == 1:
            try:
                wd.execute_script('document.querySelector("....").click()')
                time.sleep(5)
            except :
                view_more_button = 0
                pass
        
    #     Get all the items 
        elements= wd.find_elements('xpath',"//div[@class='.....']") 


    #    wd.save_screenshot("scraper.png")
    #    return send_file("scraper.png")   <----  SHOWS EXPECTED OUTPUT (also ,I am not blocked or asked for Captcha)

        
       for element in elements :
         sub_element=element.find_element('xpath','//div[@class='....']')  <----- ALWAYS THROWS ERROR HERE
 
    return "OK"

Could you please let me know what I'm doing wrong? I've been trying to solve this for days literally! Thank you !

P.S. Works as expected in Cloud Run/Jupyter

EDIT: This is the stack trace :

"Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2073, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1518, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1516, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1502, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/app/main.py", line 360, in scrape_stuff
sub_element = elements[element_index].find_element('xpath',".//span[@class='....']").get_attribute('innerHTML')
File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 634, in execute_script
return self.execute(command, {
File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidSessionIdException: Message: invalid session id"

Additional edit : I have printed the webriver session id Before and In the loop , and everything shows the expected behaviour :

2022-08-24 11:46:32.000 CEST
SESSION ID BEFORE LOOP d361399a553f0ce677665c0326156c23
2022-08-24 11:46:32.000 CEST
WEBDRIVER OBJECT <selenium.webdriver.chrome.webdriver.WebDriver (session="d361399a553f0ce677665c0326156c23")>
2022-08-24 11:46:32.000 CEST
SESSION ID IN THE LOOP d361399a553f0ce677665c0326156c23