Fall through world at certain coordinates (usually X and Z = power of 2 - 1).

The bug

You can fall through the world at x:65536 z:65535 by slowly walking against blocks.

How to reproduce

1. Make a world, and teleport to the provided coordinates.

   Seed: 2124988472
   Coordinates: /tp 65534.5 68 65535.5 180.6 50
   

2. Don't move your mouse, walk forward and you'll go slowly towards x:65536 (to the right).
   → While moving to x:65536, your screen starts stuttering and you fall through the world

Thanks to xp2_882030kgz010602 for discovering.