Credits to Atherion.

1. Freecam about 9 blocks away from a wall.

2. Break 1x4 hole up the wall.

3. Go out of freecam and walk up to the wall where you broke it and walk inside it kinda.

4. Turn on Sprint/Sneak/Flight and reconnect.

5. Hold whatever you use to move forward while reconnecting.

6 Magic! Your on top!