document GetGridPath / SetGridPath
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Zamiell commented
Grid path is a property of a square that represents a pathfinding "cost".
Some enemies set it to 900 when they path over a square.
Fireplaces set it to 950.
Most grid entities set it to 1000 or higher (so that enemies will not try to path through the grid entity.)
If a grid square has a path higher than 0, it can prevent a grid entities from being spawned on that square. Thus, you can get around it by resetting the grid path to 0, and then spawning the grid entity.