Projectiles stuck in the world border can float in the air if the border size is changed

If the world border size is changed after a projectile has gotten stuck in it, the projectile will remain hanging in mid-air.

Steps to Reproduce:

1. Set the world border to ten:

   /worldborder set 10

2. Use a bow and shoot an arrow at the border

3. Expand it

   /worldborder set 20

Expected Result:

After the world border is changed, the projectile(s) stuck inside it would update, and fall downward.

Observed Behavior:

The projectiles are stuck in mid-air, floating.

Screenshots/Videos: