Is this on the ISO or after installation?

If after installation, what's the output of this in the terminal

id

This is after full installation, the output of id is:

uid=1000(haon) gid=1000(haon) groups=1000(haon),10(dialout),11(audio),12(video),15(cdrom),19(lpadmin),28(sudo),70(scanner),90(plugdev),100(users),104(fuse)

My full name is correctly recognized at login screen and in the start menu

Anything notable about what you added in the installer? Like special characters in your name?

@folcred blank for you on your fresh install?

Maybe it needs a rundep I haven't seen due to already having it installed. I can grep the source code if that's the case

nothing notable in installer, username was set to haon, and full name to Jakub Gawlik, so no special chars

Hadn't checked it, but yeah, mine's blank too. Nothing special during the install, and it was a clean disk, no earlier system or settings.

Do you have accountsservice installed?

Installing accountsservice fixed the problem for me, thank you