Kivy dual TreeView deselect_node behaviour

import kivy
kivy.require('1.10.0')

from kivy.app import App
from kivy.lang import Builder

root = Builder.load_string('''
#: import TreeViewLabel kivy.uix.treeview.TreeViewLabel

BoxLayout:
    orientation: 'vertical'
    BoxLayout:
        orientation: 'horizontal'
        TreeView:
            id: tv
            on_selected_node:
                state.text += "on_selected_node "
                tv2.deselect_node()
        Button:
            size: (200, 50)
            size_hint: (None, None)
            text: "add_node"
            on_press: tv.add_node(TreeViewLabel(text = "Node"))


        TreeView:
            id: tv2
            on_selected_node:
                state.text += "on_selected_node "
                tv.deselect_node()
        Button:
            size: (200, 50)
            size_hint: (None, None)
            text: "add_node"
            on_press: tv2.add_node(TreeViewLabel(text = "Node"))

    Label:
        id: state
        text: "State: "
        halign: 'left'
        text_size: self.size
        color: 1,0,0,1

''')

class TestApp(App):
    def build(self):
        return root

if __name__ == '__main__':
    TestApp().run()