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Not sure if this is where to put this, but one bug is that the Nexus turret will pull aggro from minions by the inhibitor while it's still unable to be damaged (ie. no inhibs down.)
To better explain, the last game i was in we killed the inhib turret and the backed off. Our minions pushed to the inhib, but about half of them stopped attacking the inhibitor and started attacking the nexus turret (before the inhib was down). This caused the inhib, which should have gone down, to survive because half the minions were attacking the invincible nexus tower.