Bonemeal Action Doesn't Work

Basically, I'm making a ranged item that when the bullet hits a block, it applies bonemeal... and it works... except, not after I export the mod. I made the procedure and when I went to test it, I pressed "Run Client" and it worked in the preview. Satisfied with the procedure I exported the mod to a jar file. I ran the mod from the Minecraft Launcher, and the bonemeal action doesn't work. Anyone know why?