Why can’t I get this questioned answered?
You are asking this question for the second time; and both times you don’t cite the warning message exactly as you see it; nor do you provide a screenshot; nor tell which buttons you use to print; nor mention which printer is selected in the print dialog. No mention of LibreOffice version or your OS. That’s why you can’t get this question answered.
and… is better an short title and large description
Please give your favorite fortune teller a call … mine is on vacation
Here’s a screenshot of WordPad on Win10 with a DOCX; the warning is there as you wrote it.
But … to show it, I had to open the DOCX with WordPad, and I used Explorer to do that … and LibreOffice was absolutely unrelated to that. So - you need to provide a very detailed description what you do to get such a result using LibreOffice, that no one seems to have ever had.