Appsheet suddenly not able to print table borders in PDF

I have set up a process that generates a PDF printout of the data entered in the appsheet. I use an “attachment template” so the generated PDF looks really good.

For several months, the PDF template has been working really well. Just today, all the table borders (and even shape lines) are no longer showing up in the generated PDF. I have triple-checked the templates to make sure the borders are there, and even tried to change colour just to see if will pop up - nothing is working.

Are you guys having this same issue? The attachment template is created using the latest MS Word. See generated PDF output vs the template file

Please file a support ticket for this, thanks.