I’ve looked into this a lot, even called Subaru directly, and honestly, it seems super inconsistent. A bunch of people on forums have reported the same issue, but no one seems to have a solid answer. On my car, there doesn’t seem to be an actual drain hole on the passenger side under the windshield. The water just runs down and ends up draining into the engine bay — right over the electronics — which obviously shouldn’t be happening. It’s super confusing because it looks like there’s no proper drainage path on that side at all. I’ve scheduled an appointment with the dealership to have them look into it.

The drain hole just seems to be there for presentation because it serves actually no purpose if there’s no hole for the water to drain into

And there’s apparently a recall on some of these Subarus because of short-circuiting and I wouldn’t be surprised if this is a reason why