HUD is ZeesHUD.

I was playing a game of Big Apple Barricade on Bootcamp earlier, and on Wave 4, we had gotten pushed back to the point of the bots capturing both gates.
After we managed to beat the wave, the barricade that blocks the frontline when the first gate is captured wasn't gone, and it stayed that way even after the wave had started.
When that happened, the boss giant Soldier spawned on the first gate rather than the frontline. This was odd in and of itself, but everyone went over there anyway.
That is when we discovered that all the gates are blocked, causing the game to be soft-locked and forcing us to restart the mission.

I did a quick Google search to see if this had happened to anyone else before, but I only found things related to the bots improperly spawning, so I'm wondering if we had discovered something new.
I don't quite know what the specific reasons are for this, as we were playing the game regularly up to this point, and I doubt having the gates captured on Wave 4 is the sole reason of this happening.
I'd like to know if other people have experienced this or if someone out there knows why this happened.