I found a possible work-around in case someone else wanted to test. Try disabling a local printer notification in the Windows Print Server Properties. You'll use a Command Prompt opened as an Admin, then launch that properties window
See this post for details on how to open that options window: https://answers.microsoft.com/en-us/windows/forum/all/getting-to-print-server-properties-from-cmd/2f9dd64b-705c-4743-860a-570e38742129
Once in the options window, select the Advanced tab.
Disable/deselect the option for, "Show informational notifications for local printers"
Click Apply then OK to close the window.
This worked for my USB-connected laser printer. No odd "POST" informational print-outs for 24 hours so far.