When you place a falling entity on a wall, so it falls, and break the 'block' where it lands, it will look like it teleports back to where you placed it and fall again. This allows you to duplicate falling entities, like concrete powder, ender dragon eggs, sand, gravel, anvils, etc. This only happens when setting falling sand "Time" to 1 constantly.

Steps to reproduce:

1. I have made a video! Here is the link.
   CLICK HERE

~Space