That is interesting, I haven’t seen it try chopping after it has switched to the stump.
I have seen what I’ve called Ironwood trees, where the collision occurred with the ball moving at a tangent causing it to slide down along the side of a tree. Upon collision it chops and then slides one step along the tree object, triggering another collision and a chopping animation. It repeats this a few cycles before the ball exits the tree’s detection radius, causing the tree’s collision box to finally get removed. The end result being that it looks like the tree required a bunch of extra chops, but the tree title stays in place through this bug, errr emergent feature