KB5006670 Breaks Windows Network Printing

Since Windows Updates were released Tuesday, we’re receiving an increasing number of calls from customers who are unable to print.

So far, in all cases, the printers are shared from a server in a non-domain environment.  Uninstalling 2021-10 Cumulative Update for Windows 10 resolves the issue (KB5006670).

After uninstalling KB5006670, you probably want to Pause updates until Microsoft resolves this issue.
Settings > Update & Security > Advanced options > Pause updates.

Hopefully, Microsoft will fix this issue soon.
October 12, 2021—KB5006670 (OS Builds 19041.1288, 19042.1288, and 19043.1288)