@kregoraThis is currently broken beyond belief. We do that usually. We join with 4, split up and then create a new party. The others join by joining the two existing parties. This was working before the latest patch.
What happens NOW is that say if player 1-4 join, player 4 leaves the party and created a new party and then invites player 5 to join his new party, often player 5 (the one that joins AFTER all others are on the server) is placed on the opposite team. And once player 4 dies (the one that was with 1-3 on the server first and had to create a new party) he is switched over to player 5 and is in the enemy team as well.
This game is NOT made to play with more than 4 players. It is painful and for us the reason why we play with max 4 players now and switch to BF5 as soon as Teamspeak fills up.
Priority for us is playing together and playing BF2042 comes definitely second to that. It was nice up to BF4, after that, this aspect of the Battlefield went downhill with every iteration.
I guess in BF7 there won't be any parties or squads at all and you can only matchmake to play with randoms. IF there ever is a BF7 that is.