Does anyone know why when you use the brush:
/b en Item

and then select an item say

/v log

When you right click with either gunpowder or the arrow it says "Cannot spawn entity!"

This brush does not use the /v command OR item parameter

In game type /b entity info

This prints all usable entity names

Then do
/b entity (EntitynameHere)
/b (#AmountOfEntitiesToSpawn)

EX: /b entity XpOrb | /b 10 | Arrow Click Would spawn 25 orbs at the arrows clicked position