processing block only working once

I made a block that when right clicked will remove 1 item from the main hand and then spit out an item after a delay, it worked fine but after added a second one into the world it broke, now neither work? i guess its cause 2 where running at once but idk how to solve it? i thought block states but that didnt seem to work either

Event Trigger (on right click)
if item in main-hand of Event/target entity = "Plant"
do
shrink item in main-hand of Event/target entity for 1
wait 20 ticks then on server-side
do
call procedure "drop shake"

Drop Shake

Event Trigger
spawn dropped item "shake" at x y z pickup delay 0