Put the summary of the bug you're having here

What I expected to happen was...:

I was expecting the fireball from the Ghast to go through the portal and teleport to the owerworld

What actually happened was...:
Fireball from the Ghast passed through nether portal without teleporting to the overworld

Steps to Reproduce:
1. stand between nether portal and Ghast in the nether
2. let Ghast shoot at you and then dodge the ball
3. If it goes through the portal it will pass through like there's no portal at all and will still land in the nether instead of Owerworld