Has there been a change in how PDF files are generated?

[Viktor]

I’ve been using a few workflows in my app to generate PDF files which are then printed out automatically. However, from the 12th February and forward, the PDF files have not been able to print, and I’ve noticed a small change in the PDF file itself. Generally the PDF just contains a barcode which is generated from a webservice (Free Online Barcode Generator: Create Barcodes for Free!) but there seems to be a difference in how the image from this webservice is embedded into the PDF

Below are two images that show the difference

The first image is of a PDF that works (is printable). Notice how the yellow box (that appears when you hover over the barcode) only covers some of the numbers/letters. The yellow box is a link to the URL that returned the image (in this example:
https://barcode.tec-it.com/barcode.ashx?data=Test0001&code=&multiplebarcodes=false&translate-esc=fal...)

The second image shows a PDF that does not work (printer won’t print it). Here the yellow box covers all of the barcode. I do not know if this is the actual issue, but this is seemingly the only difference between the PDFs that work and those that do not.

Any suggestions on how to fix this are greatly appreciated!

Best regards