KDE Okular – now seems to be handling Electronic Signatures in PDF documents

Okular Version 1.6.3KDE Frameworks 5.55.0
Qt 5.9.7 (compiled against 5.9.7)
The xcb Window System

I can’t find anything related in recent Leap 15.1 patches and updates but, today on checking a PDF document from a Bank which has an Electronic Signature, suddenly, Okular’s Print Preview shows the document and, I can print it, from Okular.

  • Up to last month, I had to copy the PDF file to a USB Stick, walk to the printer, and then print from the file on the stick …

Does anyone happen to know which KDE patch and/or update has changed Okular’s Leap 15.1 behaviour with respect to signed PDF documents?