I was just recently doing the Single Training Center event and I noticed that a single wave of enemy's minions had become invulnerable.
IGN: Xeenoblood
Server: 12
My Team: Noro, Hinami Fueguchi, Amon-Dojima+
Enemy Team: Kaneki Rinkaku, Tsukiyama Gourmet, Eto
The minions were still taking damage like normal but their health bars would not go down. This persisted through the end of the game. There was roughly another 10-12 waves of units that spawned in between this group becoming invulnerable and the end of the game.
Not entirely sure how to recreate this but definitely something that should be checked out.
IGN: Xeenoblood
Server: 12
My Team: Noro, Hinami Fueguchi, Amon-Dojima+
Enemy Team: Kaneki Rinkaku, Tsukiyama Gourmet, Eto
The minions were still taking damage like normal but their health bars would not go down. This persisted through the end of the game. There was roughly another 10-12 waves of units that spawned in between this group becoming invulnerable and the end of the game.
Not entirely sure how to recreate this but definitely something that should be checked out.