To reproduce:
Trap a ghast in a obsidian cage with a nether portal in front of it. Go into survival and make shoot a fireball. Go through the portal and see you can a fireball on the other side. The fireball is also in a limbo state where you cant get rid of it until you restart the world, making it explode.
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This is actually a duplicate of MCPE-36104.
Disallow Fireballs from travelling through portals to prevent an issue where they could become permanently stuck
MCPE-36104 is still unresolved (at least I was able to reproduce it with snowballs). This "fix" didn't really solve the main problem, it only introduced a parity gap with the java edition.
What are your expected results from a ghast shooting a fireball into a portal?