Oct 12, 2021 - KB5006670 released - Windows 10 servicing stack update (SSU) - security update.

• Addresses a known issue that prevents an internet print server from properly packaging modified printer properties before sending the package to the client.
• Addresses a known issue that [STRIKEOUT:might] ask for administrative credentials every time you attempt to print. This occurs in environments in which the print server and print client are in different times zones.

Known side effects	Recommended workarounds (by Microsoft)
Installation of printers using Internet Printing Protocol (IPP) [STRIKEOUT:might] not complete successfully.	KB5006738
Windows print clients [STRIKEOUT:might] encounter the following errors when connecting to a remote printer shared on a Windows print server: 0x000006e4 (RPC_S_CANNOT_SUPPORT) 0x0000007c (ERROR_INVALID_LEVEL) 0x00000709 (ERROR_INVALID_PRINTER_NAME)	KB5007253

Oct 15, 2021 - New Windows 10 KB5006670 update breaks network printing BleepingComputer.com.

“Windows 10 users and administrators report widescale network printing issues after installing the KB5006670 cumulative update and other updates released this week. [...] Since installing the KB5006670 update, users are reporting that they cannot print to network print servers, with some users receiving 0x00000709 or 'Element not found' errors when attempting to print. [...] Windows administrators recounted their frustration with the printing bugs and came to the same conclusion — uninstalling this week's updates resolves the problem. [...] However, uninstalling the update will remove the security fixes for 74 vulnerabilities, including one actively exploited, making this a dangerous method.”

Oct 16, 2021 - 📢 PrintNightmare is back with the latest Windows 10 Patch Tuesday update KB5006670 kunal-chowdhury.com.

“Many users over the world started reporting printing problems when connected to a network printer. If you have just received the error "0x00000709" or "Element not found" while printing, you are one of the victims. [...] If you have a network printer installed, the bug will prevent you from printing. At this moment, the simplest workaround is to uninstall the KB5006670 update from your system if you have encountered this printing issue.”

Oct 18, 2021 - KB5005565 and KB5006670 lost track how to fix shared printers r/windows.

“14 September patch (KB5005565) broke all my shared printers, I went to every PC with a shared printer, uninstall the patch and disable windows update for a month and that worked till last week when KB5006670 was up, then shared printers stop working again, but this time I had to go every PC which connect to those printer uninstall the 6670 patch and disable updates in order to print again. I want all PC's updated but I can't afford going though all the fuzzle if is not fixed.”

Oct 19, 2021 - Windows 10 KB5006670 update breaks network printers – how to fix it IDG Tech Advisor.

“Windows 10 is suffering from yet more printer issues. Many people will have been eager to install the KB5006670 update from 12 October – it fixed a total of 74 vulnerabilities, including one that had already been exploited. However, a new problem has arrived alongside it. This bug affects network printers, preventing users from printing wirelessly using this method. Despite following the usual steps, ‘0x00000709’ or ‘Element not found’ error messages have often been appearing. It’s important to note that not all Windows 10 devices are affected, but it does seem widespread. Printer-related issues have plagued Windows 10 in recent months. They primarily relate to the ‘PrintNightmare’ vulnerability, but there have been other problems concerning the printer spooler - both can be used to gain remote access to affected devices without the user’s permission.”

Oct 20, 2021 - KB5006670 for Windows 10 is having quite a few issues, some unconfirmed GHacks.net.

“Users are reporting however that network printing is not working correctly, and that they receive errors such as "0x00000709" or "Element not found". The issues appear to be related to Microsoft's ongoing attempts to deal with printing related vulnerabilities that are commonly known as PrintNightmare. The issues are exploited actively and common solutions, such as uninstalling the KB5006670, will make the system vulnerable again to these attacks.”

Oct 21, 2021 - PrintNightmare - KB5006670 - Poke holes in my plan to abandon my print server without losing automation for mapping printers r/sysadmin.

“If November updates do not fix this I’m thinking about bypassing the print server model completely to avoid this constant headache.”

Nov 1, 2021 - Windows PrintNightmare status Nov. 1, 2021 (KB5006674, KB5006670) borncity.com.

“Microsoft has been patching the PrintNightmare vulnerability since summer, but keeps creating new problems. Even in early Nov. 2021, the printing problems have not been fixed.”

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Above are all Google search results I considered relevants, for the expression «intitle:"KB5006670" "PrintNightmare"», written in languages I can understand. Completely ignored, due to the low average quality of content: social networking websites; forums; questions and answers websites without reply voting/replier reputation systems; and email discussion lists.