Beacon ranges have blind spots around the corners, although their ranges are labeled as squares, there are 2 sets of beacon levels that have blind spots in their corners where it doesn’t give the player effects. Levels 2 and 4 of the beacon have these corner spots without effects, attached is a picture of the different levels with glass blocks placed on top of the gold and diamond levels (2 and 4, respectively) that you’d expect to have the beacon reach.