Windows Server build 25246

Windows Server build 25246 is the eighteenth Insider Preview build of Windows Server based on the Copper codebase. It was released to Windows Insiders on 16 November 2022.

Taskbar

 * The ability to display seconds in the system clock on the taskbar, which had been absent since the original release of Windows 11, has been re-implemented. This feature is disabled by default, but can be toggled on manually by enabling the  velocity ID and then toggling the switch under Personalization > Taskbar in the Settings app.
 * The ability to prevent taskbar application icons from combining, which had been absent since the original release of Windows 11, has been partially re-implemented.
 * Although this feature is supposedly to be enabled by enabling the  velocity ID, it is inaccessible.
 * A new animation for the hidden icons chevron has been added.

Boot environment
The entire boot environment was built with  defined (previously only defined in checked builds). On entry and exit of every bootlib API call, all physical memory chunks and heap chunks are checked for corruption. (With an undocumented BCD element, the frequency of checks can be decreased; however it defaults to zero, thus always checking.)

Bugs and quirks
The App Compatibility FOD may fail to install on Server Core post reboot with error message "Something didn't go as planned. No need to worry-undoing changes. Please keep your computer on."