Post: #2

to make items stack on each other they must have exactly all the same props (name, type, events, etc)

I don't remember exactly, but I think LOCAL.Arrow on @Hit / @HitMiss trigger also store the arrow UID being consumed, so instead create a new arrow you can dupe this one to make the new arrow keep all the same properties. Maybe it's something like this:

PS: if you're handling the arrow by yourself instead let sphere do its internal actions with the arrow, don't forget to add LOCAL.ArrowHandled=1 on the trigger to make sphere skip the internal arrow handling