The only way to fix the update bug is to uninstall it. But you should know, Microsoft offers some security patches in the kb update, and deleting KB5009543 and KB5009566 updates can remove all fixes for vulnerabilities patched on January 11, for example, vulnerabilities in the Windows Internet Key Exchange (IKE) protocol and Windows Remote Access Connection Manager.
Before uninstalling these updates, you should weigh the risks of unpatched vulnerabilities versus the broken VPN connections. If you decide to uninstall Windows 10 KB5009543 and Windows 11 KB5009566 updates, follow the steps:
Step 1: Launch Command Prompt (CMD) with admin rights via the search bar.
Step 2: In the CMD window, type the command based on your system – Windows 10: wusa /uninstall /kb:5009543 or Windows 11: wusa /uninstall /kb:5009566 and press Enter.
Source : https://www.minitool.com/news/windows-11-update-break-vpn-connection.html