Give me a new username

Does not relate to MC-162518 

There is a mod, that lets you increase the maximum packet size. https://www.curseforge.com/minecraft/mc-mods/randomtweaks

Fixed!

This is not a bug, it is actually meant to work this way.

This definitely does still occur, and this applies to normal games and not just realms. Most of the time I even hear a hitting sound, but the fireball explodes.