So from the 8/30/18 Beta launch I've run into a problem a few times where I would connect to a match to be put into a spectator slot instead of a Def/Atk side. It was three times when I solo queued and twice when I was in a party with one other member. A few instances there WAS slots available to join on one of the sides how ever I could not slot into a team from spectator even though the teams were clearly unbalanced and there was room for more members. I'm not entirely sure what caused this to happen other than possible my load time into the servers as my game tends to freeze right around the 95% to 100% for a few moments.