dimitrios1988
Hello and welcome to the forum 🙂
The library we use for PDF generation does not handle all charsets by default. It requires specially prepared fonts and they need to be added to the library during execution. Right now, we have no option for this in the standard.
Because this library has some downsides (like not handling non-ascii charsets well) and it stopped being developed, we are looking at replacing it. Unfortunately, there are very few option available, limited by our tech stack and dependencies. I hope, we can find a good solution for the next feature release (R3.8) but I cannot guarentee it. In the meantime we have to use workarounds, like using only ascii characters. It is not great, in any event.
Btw. development of the PDF library stopped only a few months after we have integrated it - that was lucky timing indeed.