I have never had a cane arrow break on release or on impact. I have noticed while making cane a that there was small hole at a node that was made by a small worm. These holes weren't obvious to me while collecting the canes. I think that by going through the process of straightening cane shafts and making the arrows puts enough stress on the cane, in most cases, where any weakness will manifest itself.
Why did your cane arrow blow? Did you investigate what the problem was with that cane arrow to make it blow? Pat