Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to update cause pin issue.
Firstly you can try uninstall that 2024-09 CU and reboot machine, then monitor if the issue disappears.
I checked the September 10, 2024—KB5043076 (OS Builds 22621.4169 and 22631.4169) website, it seesm there is no known issue related to this update been published, but you can keep monitoring this website and check if there is new info:
September 10, 2024—KB5043076 (OS Builds 22621.4169 and 22631.4169) - Microsoft Support
Have a nice day.
Best Regards,
Molly