[Snake]

So dense tiles generated on top of the enemy's spawns will make the enemy spawn on the ally's spawning tiles instead of a random square to the enemy side (like before).

This is probably not intended and a bug. And I think worst would have happen in that situation if the fight was a 4v4, like people spawning on top of each other. I've seen monsters doing this quite frequently, and the best way to test this at is on Tannis's Black Beast raids.