Oakheart Root
Yes, and the problem appears to be much more deeply rooted (har har) than this. Perhaps you’ve noticed not being able to attack certain other inanimate objects, such as roadblocks, bandit mines, etc. with certain ranged attacks? It’s probably all related to the targeting system’s obstruction detection aspect. This is an important bug to get rid of, but it’s been reported for months and nothing’s been done yet.