oh, huh, I just switch to safari today (got tired of Edge freaking out, and the less said about chrome the better) and just saw your note about safari saves. Too bad.
I am also on Safari and I could not fix the issue in none of my games. Sometimes it works for a couple of days but then either due to the new game release or some internal rules everything is wiped out. I guess it is due to the cross site tracking you mention - that I have not checked
Yeah I think having some kind of export would be cool. Maybe even in a form of a huge encoded string like the old flash games used to do