[2.0.41] Biter stuck near roboport, possibly due to large build

[tinker9]

What did you do?
I built out my base into areas that biters were regularly walking through, using a blueprint or copy/paste containing roboports, radars, and electricity poles.

What happened?
Most of the biters attacked the buildings being built by the bots. One of the biters just didn't do anything, even though it was in range.

What did you expect to happen instead? It might be obvious to you, but do it anyway!
The biter attacks the roboport or radar near it.

Does it happen always, once, or sometimes?
Occasionally, but it's hard to tell exactly why.

Save game: https://www.sendspace.com/file/4i7q3x