I made these Oni using the shade just above them. Originally there were alot more which I told to go to a particular position which majority of them followed. However when I came back to this shade I noticed this group just sitting there. I tried sending them to another waypoint but they wouldn't move.
Seems just a case of stacked units pushing eachother around. You can see the same effect from arcs and macs. Build a bunch, but don't put a waypoint from the structure. They will stack infinitely until a move command is issued. Then they start to 'collide' and push eachother out of the way until you get a long line. Looks like you managed to push a few out of the map. Just how many hallucinations did you make?
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Can you post some steps to reproduce? How did they end up outside the map?
That's pretty much all I did.