It is interesting that it took the pictures if the dots weren't being drawn. That shouldn't happen. DJI hasn't told us much about what happens in the presence of an airport. We have implemented the warnings that they have provided but it is a bit hard to test... The camera preview blinking does mean that the images were being taken.
The airport keep out zone system should have allowed you to fly higher than 60m that far out without issue.
We will keep an eye on that and try to see if this issue comes up in the simulator.