Pathfinding Around Clogged Areas

Sometimes the ants get into a super long fight with a crab or twenty, and the ants do not path find around the obstruction. This causes the most problems when a bunch of ants group together and clog a path to brood chambers. In the enemy scenario, I think that ants that cannot reach the enemy, or are told not to fight, should work their way around it, either getting past it or surrounding it. This doesn't happen much, but would make the game better when it does happen if it was fixed.