This is easy to confirm. Just start a world, summon a fireball then try to punch it. Sometimes they unload then reload (the invisible element of this bug) which allows you to hit it sometimes, since as previously stated, if you leave render distance then return you can also hit the fireball.
Pavard
This is easy to confirm. Just start a world, summon a fireball then try to punch it. Sometimes they unload then reload (the invisible element of this bug) which allows you to hit it sometimes, since as previously stated, if you leave render distance then return you can also hit the fireball.
Initial Fireball summon is bugged.
1.14 pre-release 4 still present.