fname not saved

[panaak]

Hi there, this is most unusual and absurd thing. The one thing that is most important doesn't work. When saving session to a file, the workgroups are saved, but the buffer-file-name is not. Actually sometimes it is saved, but it seems to be totally random.

tried
emacs 24
emacs 25
emacs 26

clean init script only with workgroups enabled with standard customization.

i switched from using workgroups2 because it slows down emacs session over time. workgroups looked great at first, but this renders it unusable.. :/

it is possible i'm doing something wrong, but i don't know what..?