Swarm stuck because an infuser creep would not move away/pushed

[zGeneral]

https://screeps.com/a/#!/history/shard2/W29N49?t=16034065

as seen in the image above, the infuser would not move away nor the swam would move around it.
they are just stuck there indefinitely until I suicided the infuser.

also, the swam selected a very long path because there was a choke point of one tile in the shortest path, may be the swam should be flexible in transit rooms

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