Microsoft's KB5004945 update to fix PrintNightmare is breaking some printers
The PrintNightmare vulnerability that was accidentally revealed recently has led to an almost laughable chain of events. After Microsoft suggested a workaround, a third-party released a patch, an official patch was eventually released, and said patch was found to not actually do the job it was supposed to.
The patch is not only ineffective -- although Microsoft disagrees -- it is also, very much in the tradition of patches for Windows, causing issues. People installing the KB5004945 patch report that they then have problems with printing.