I don't normally recommend installing Windows 11's optional updates – but in the case of this bug, I'd make an exception

Wondering why your Windows 11 desktop keeps vanishing? It's because of this nasty bug.
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Microsoft says latest Windows 11 issue crashes explorer.exe, makes taskbar disappear, but a fix is rolling out

A bug in Windows 11 is crashing Explorer.exe, which could make your desktop UI disappear, including the taskbar.