The bug

When I summon an arrow, it always has a particle effect, like a potion. Only arrows shot by bows or skeletons don't have effects.

How to reproduce

/summon minecraft:arrow 

or (on an arrow shot by a bow)

/data merge entity @e[type=arrow,limit=1,sort=nearest] {pickup:1b}

pickup:1b can be anything, just that is doesn't say Nothing changed!