My dog does the same thing... Check out the pic below lol. Sounds like you have a pretty lockdown treedog! Theres only a couple negative things that I can see from this and one of them you already stated... it causes commotion around the tree... which could result in a fight if theyre with the wrong dog. Another negative would be that if your dog is chewing saplings off and at the same time acting nuts around the tree, theres a good chance your dog, or another dog could jump up and land on one of those sharp trees.
I really don't think there's much you can do about it. most dogs just do it out of pure frustration i believe. i just tell mine to stop it and get on the tree when she starts. sometimes it works, sometimes it doesn't lol!