KB5059091: Out-of-band Fix Update

April 16, 2025—KB5059091 (OS Build 17763.7249) Out-of-band

Improvements
This non-security update includes quality improvements. When you install this KB:

• This update fixes an issue caused by 2025.04 B container images released on April 8, 2025 where Windows containers running in Hyper-V isolation mode could fail to start in some cases if their update level didn’t match that of the hosting utility virtual machine (UVM). The mismatch caused compatibility problems between system files, leading to startup failures. With this update, containers now correctly access the necessary system files from the host, improving reliability and compatibility across different Windows versions.