Beacon area of effect - parity issue.
In java the area of effect is a square collumn, 50 blocks on all sides from where the beacon is placed expect for up. In Bedrock the corners of square in the horizontal positions are cut off. I think it is trying to implement a round collumn or radius 50 or 51 instead of the square collumn like in Java, makeing the total number of blocks it affects a bit less!