Z fighting with ghost blocks

Steps to Reproduce:
1. run /worldborder set 100
2. place one block adjacent to the world border and another inward
3. place a piston such that it will push the second block into the first
4. activate the piston
5. The two blocks will Z fight

If the world border is moved after this, the ghost block will move to its actual position as a moving_piston.

Related to MC-158821