LEAK: 2787 KJS::Node Is this a bug?

When printing an IRS Estimated tax form to a Brother B&W 2170 printer with a USB connection using Debian Bookworm stable up to date as of 9/2024, the above notice up when I used this command to open okular and this is what came back besides opening okular. Okular seemed to function correctly.

okular EstimatedTaxFormFederal2024-f1040es.pdf
LEAK: 2787 KJS::Node

Is this a bug?