'Sequence.stop_property()' doesn't affect to the next part of the animation

main.py

# case A ... 'stop_property()' affects to the next part of the animation
# case B ... 'stop_property()' doesn't affect to the next part of the animation
#
# This behavior confuses users.

from kivy.animation import Animation
from kivy.app import runTouchApp
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.clock import Clock


root = Widget()
button = Button()
root.add_widget(button)


def start_anim(dt):
    anim = Animation(x=200) + Animation(x=0)  # case A
    # anim = Animation(x=200, y=200) + Animation(x=0)  # case B
    anim.start(button)
    Clock.schedule_once(lambda *args: anim.stop_property(button, 'x'), .5)


Clock.schedule_once(start_anim)
runTouchApp(root)