It seems to be that when deflecting ghast fireballs, they pass right through the ghast. No matter what angle or how close or far away I am the fireballs go right through it. Yet when I even punch the ghast with my bare fist it dies. The explosion of the fireballs is also delayed after deflecting them.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-30793.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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