On XB1S Bedrock (v1.9), you can glitch through blocks using water

You can easily glitch through walls using water. Using the attached design (where all glass is a solid block), just hop into the main water source, and start swimming towards the wall. Once you hit the wall, start swimming upward. I believe this is similar to what AntVenom reported ( https://youtu.be/q3BvjYdqM0g ), but is much more noticable when using water.