The Party System seems to be broken since 2.4.1
Before that patch it was like this:
someone opened a party as a leader and invited others
if you got Officer rights, you could invite too and remove every party member, who isn't officer
party was persistent all over the time, even after a relog
After the patch:
party window is empty with each relog
if you needed to relog and got a reinvite and got promoted to Officer, you didn't see the party kick buttons at anyone else
if you invite as a party officer, you just see the kick button for this one, but not the other ones
if a party leader need to relog, the rest of the party is existing, but you can't reinvite anyone, maybe because no leader exist
that means you need to disband the party and open a new one