I was just looking for this information, since previous posts seem to indicate that triggers are ignored by default. This is not the case for 2D triggers, it seems. Base.cs does not seem to include a query for Physics2D, just Physics.
Anyway, setting “Queries Hit Triggers” in the Physics2D settings resolves this issue, but I’m not sure if it will lead to other problems with my project down the line, as it is enabled by default.
2D triggers should also be ignored on A* Pathfinding Project’s end as they are for 3D triggers.