[Bug] A player disappeared completely

Me and another guy were trading players for week 2 AFTER EU lock but BEFORE NA lock, and we ran into a bug which caused us to be only able to field 6 positions, so we traded everything back to resolve this issue. It worked, however, upon dropping Lustboy and adding Nrated, Lustboy just disappeared from my team BUT didn't appear in free agents. He was still visible in my roster (but not in Add/Drop page) as FOURTH alternate until NA lock, but after NA was locked and Week 2 roster unlocked, there's no sign of Lustboy anymore. I really need him for my full Korean roster, Riot pls :(