Okular smart card signature issue

Dear community,

I’m using okular to add digital signature on some pdf files.
I’m not sure when the problem occured, but now, even if I able to sign the document, the drawing rectangle use to validate the signature is empty.
Previously, when drawing a rectangle, and after validation of my pin code, the produced document shown the rectangle with first and last name + signature date.
Now, only a grey rectangle without any information.

I’m using okular 22.12.3 on rocky linux 9 (RPM)

Thanks for help solving this issue or giving clues to solve it.

likely an issue with the certificate itself not having that information for display

when i create a certificate using certutil i can specify with the -s switch a string that defines the items shown in the rectangle (see RFC #1485 spec)

for instance "CN=Last, First” will print Last, First inside the rectangle

but i don’t immediately see any way to include a timestamp

In fact, it works all the time on blank pdf document.
Works too on scanned pdf document.

But not working on some document with forms. Not sure the problem is linked to the forms, could be the fonts used or other bad interaction.