I'm not surprised at all that this happened. I'm sure there is some kind of real time liaison that is keeping these countries in the know to a degree but they don't have any real integration into our IFF I'm sure, they're scared shitless and random rockets and drones keep popping up. Friendly fire incidents are inevitable especially across allied forces.
I feel like people don't understand that in all of these operations involving Iran the casualty estimates have been much higher then we've seen. We've been very lucky so far, it helps that they're a bunch of incompetent goatfuckers too I guess.
I'm just glad the pilots seem to be unharmed.