Remember this one fact: Snakes digest rodent bones and fur. Do you really think a little piece of wood is going to affect them much?? I would say, only if it's really sharp and gets stuck somewhere, or if they take in a whole mouthful of it.

Always use aspen bedding, always feed on it with no issues. Once, one of my BPs got a piece stuck in their mouth, but they worked it out on their own before I could even open the cage door.