pdfmod doesn't open pdf with metadata

[Duns]

After upgrade to KDE Neon 22.04, PdfMod starts, but when I try to open a pdf file it say cannot open pdf document.
From a terminal I get this error:
"Caught an exception - PdfSharp.Pdf.IO.PdfReaderException: Cannot handle iref streams. The current implementation of PDFsharp cannot handle this PDF feature introduced with Acrobat 6. (in `PdfSharp')"

I'm using the last (0.9.1) release of PDF Mod and my SO is KDE Neon:

Operating System: KDE neon 5.26
KDE Plasma Version: 5.26.2
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Kernel Version: 5.15.0-52-generic (64-bit)
Graphics Platform: X11
Processors: 2 × Intel® Core™ i3-7100 CPU @ 3.90GHz
Memory: 7,7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
Manufacturer: MSI
Product Name: MS-7A74
System Version: 1.0

[Duns (jduns)]

I noticed that the problem is also in Kubuntu 22.04 lts, and in a virtualbox release of KDE Neon 20.04.
But some pdf can be opened (more or less the 2%).

[Duns (jduns)]

I noticed also that if I delete all its metadata (with pdf-arranger) I can open a pdf with pdfmod.

[Duns (jduns)]

Indeed, the program crashes even when I try to modify metadata within itself.

[Duns (jduns)]

PdfMod is a very precious app: please don't let it go down.