Swimming

There was an update that fixed the glitch to where you couldn't swim down in 1 block of water you had to get in 2 blocks of water to dive down in the oceans, and rivers, now for some reason it switched back to get in 2 blocks blocks of water to dive when it supposed to be, I'm supposed to be able to dive underwater in minecraft at 1 block of water and not 2, the game switched it back to the user having to get into 2 blocks of water to dive underwater instead of 1. If you try to dive underwater at 1 blocks of water you don't dive now but stay on top of the water as if you are running to the other side on water.