"Get out of blueprint's way" constructor pathing issue

### Description

Con building an Air lab.

https://github.com/user-attachments/assets/3d12017a-9918-4e27-bb1d-9a2be993709e

### Expected Behaviour

Moves top left.

### Actual Behaviour

Moves all the way down, because top side is blocked by con turrets?

### Reproduction steps

Cannot consistently reproduce. Encountered another bug which I'll present in another ticket.

### Other

_No response_

No source files, tests, or entry points are named, and the issue says the behavior cannot be consistently reproduced. Start by investigating constructor pathing for an Air lab blueprint near con turrets and establish a reliable reproduction; done means the constructor moves top left rather than all the way down when the top side is blocked.

Written by the indexing model from the issue text.