Was just messing around with some friends in a party earlier today and kicked one of em as a joke,
found out the hard way you cannot invite previously kicked party members.
IMO, if the party lead kicks someone and then later decides to re-invite them,
he/she should be able to do so.
Not a huge problem, I understand there's a bunch of other things going on right now,
but keep this idea in mind.
You can reinvite players who are kicked from parties.
You can't reinvite them if they go solo passed the level you were on when they were kicked, this is to prevent players from setting up bots to reinvite themselves to D16/D27 etc to spam boss fights via reinviting kicked players.