Shooting a "tipped" arrow with more than one left in your inventory duplicates existing stack of arrows THEN adds the one you picked up. Can be used to duplicate as much as a stack of arrows at a time.
Environment
I am using a java 64-bit, not sure what kind I haven't tried this on other versions as I am unaware of how to do so, sorry. 😞
Duplicate of MC-83258 – If you have not, please use the search function in the future, to see if your bug has already been submitted.