It happened at match start though, you see everyone still on their first zipline ride.
Before a match, while loading, you all wait opposite the enemy team in one of a few random places on the map. This used to be a seperate zone, but they now place you inside the beautiful map. Because you were disconnected however, for some reason the match still began (even though it should wait or cancel the match) and therefore failed to teleport you into your base at match start for the zipline ride, and when you connected back, this is where the bot walked you to.