Ghast Fireballs explode before impact

After being shot, ghast fireballs explode and set fire onto blocks BEFORE contact with any surface. Fireballs can also be reflected by player before impact and still explode.

(Edit: am unsure if this is a Realms-only issue. May happen on singleplayer although I have not checked in singleplayer.)

(Edit, again: Have tested in singleplayer survival. This issue only occurs on realms.)