'Update and Shut Down' Actually Restarts Your PC (but a Fix Is Coming)

So, when you click "Update and shut down" on your PC, you assume your PC will install any available updates, then shut down.

Windows finally fixes the “Update & Shut Down” bug that kept PCs running all night

Anew Windows 11 update finally fixes a long-standing shutdown glitch that caused PCs to reboot instead of powering off — a ...

No, you're not seeing things: Microsoft confirms 'update and shut down' restarting PCs was actually a bug

As reported by TweakTown, Microsoft has fixed a bug that causes PCs to restart when the 'update and shut down' prompt is ...
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“Update and shut down” no longer restarts PC, as Windows 11 25H2 patch addresses a decades-old bug

Starting with Windows 11 25H2 Build 26200.7019 (or 26100.7019 on 24H2) and newer, “Update and shut down" will shut down, not reboot.