In some old patch you broke totally this gamemode.
First, the match starts and the monster and minions are already attacking the first gate, no time to setup any kind of defence. I can’t believe this is a feature, this must be a bug.
Second…it’s totally umbalanced, monster always win. He is not even required, in a match the monster was bugged and the minions alone won the match.
I guess Legacy Evolve is not a priority for you but Evac mode was very fun and now it’s broken for singleplayer users.