MyLaserAntenna's faulty LosTest()
MyLaserAntenna fails it's line of sight test for entities without physics. This includes projected/preview MyCubeGrids and all MyEntities. I discovered this bug while developing my Defense Shields mod, but it affects non-modded games as well (projected grids).
In my opinion the best and simplest fix is to first check if the MyEntity has active physics and if not ignore that entity