Workers standing on map edge not findable?

[zoot]

The units in this screenshot were not findable with the "Find idle worker" button:

Edited August 24, 2012 by zoot

[Deiz]

I've seen that before.

The workers probably aren't idle, they're trying to gather an unreachable tree or similar.

I suspect that it's actually two issues. Looking around the edges of a few circular random maps, it appears that entities are sometimes created outside of the map. It might be an off-by-one, or it might be that when placing entities, only the midpoint is checked for validity. The second issue is that these misplaced entities end up being valid gather targets, which is ultimately fairly innocuous, as entities shouldn't be in the world yet outside the rendered portion of the map.