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JEMC said:

Haunted printers turning on by themselves and printing nonsense has to be one of my favorite Windows 11 bugs ever
https://www.pcgamer.com/software/operating-systems/haunted-printers-turning-on-by-themselves-and-printing-nonsense-has-to-be-one-of-my-favorite-windows-11-bugs-ever/
Word to the wise, you might want to avoid Windows 11 23H2 update KB5050092 (Microsoft sure knows how to name 'em!) for now. Turns out, it can cause USB printers to start spouting pages with random gibberish, sorry "unusual characters". Obviously, if you're into the idea of a printergeist animating itself at 3am and graunching away on its ink supply, then maybe you might want to actively seek out the update

This is, it seems, the isolated observation of a loan Redditor or whatever, but the official stance of Microsoft itself as posted on its "Learn" website for logging known issues with Windows.

In an update titled, "USB printers might print random text with the January 2025 preview update," Microsoft says, "you might observe issues with USB connected dual-mode printers that support both USB Print and IPP Over USB protocols," after installing the KB5050092 update for Windows 11 23H2 builds.

Microsoft goes on to explain, "you might observe that the printer unexpectedly prints random text and data, including network commands and unusual characters."

Tech workers will totally freak out: