It doesn’t matter where it is or what aircraft.
However, the screenshot is default Asobo A320 Neo and at default Gatwick.
It seems to be like this everywhere.
If I zoom in very close it looks normal, when you zoom out, then the lights are very squared.
I’ve seen someone else complain about the same stuff before me, but I just couldn’t find any solution.
I’ve just zoomed in on the same screenshot I provided and here you clearly see that they’re squared.
It’s very noticible on other traffic around you, further away.
Here is a ref to someone else on the forum: