Dynamic trees leaves are correctly recognized by the leaf decay algorithm, but unfortunately, they regrow after they decay, so it has no real effect. My suggestion is to replace the leaves with decayed leaves that do not decay, so eventually the trees look mottled and gross. The only other option would be killing the tree, which might be possible using the dynamic trees api. Obviously this isn’t high priority since the actual feature works correctly, and just doesn’t accomplish its goal due to the way dynamic trees works