I’m fairly certain it has been this way across all the LEM218 modules/boats. On this one the seem to have inset it a tiny bit so maybe you are just seeing it now? End of the day it is a module in a boat, so it has to go in and come out from the top. I suppose they could have put a little metal lip around the edge to hide the edge of the pcb but I have my doubts any added drop protection that might add but it would have been a nice touch.
That is the V2 which had actual overhang from the boat.