Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to issues after install KB4512578.
As KB4512578 is a very old update, it might be outdated and cannot provide enough security protection and updates needed. It is recommended to install the latest windows update for server 2019, which is November 12, 2024—KB5046615:
November 12, 2024—KB5046615 (OS Build 17763.6532) - Microsoft Support
You can try install the latest update by clicking Settings/ Windows update/ Check for updates. After installation machine need reboot.
Have a nice day.
Best Regards,
Molly