confirm_removal() emulator function fails with statenotfound error

Rev 810 (https://code.launchpad.net/~renatofilho/ubuntu-ui-toolkit/fix-1236464/+merge/190496) added UITK emulator function to test swipe-to-delete and confirm delete a list item standard. On utilising this emulator function on a list item, one can notice (visually) that the emulator function swipe_to_delete() and confirm_removal() work as expect i.e they swipe the list item and click the delete button. However the tests still fail. The error message shown is,

Traceback (most recent call last):
  File "/home/krnekhelesh/Documents/Clock/use-default-swipe-delete/tests/autopilot/ubuntu_clock_app/tests/test_timer.py", line 118, in test_delete_preset
    first_preset.confirm_removal()
  File "/usr/lib/python2.7/dist-packages/ubuntuuitoolkit/emulators.py", line 378, in confirm_removal
    self.implicitHeight.wait_for(0)
  File "/usr/lib/python2.7/dist-packages/autopilot/introspection/dbus.py", line 213, in wait_for
    _, new_state = self.parent.get_new_state()
  File "/usr/lib/python2.7/dist-packages/autopilot/introspection/dbus.py", line 537, in get_new_state
    raise StateNotFoundError(self.__class__.__name__, id=self.id)
StateNotFoundError: State not found for class 'Standard' and filters {'id': dbus.Int64(76L, variant_level=1)}.

Ran 1 test in 19.179s
FAILED (failures=1)

For reference:
Please take a look at MP https://code.launchpad.net/~nik90/ubuntu-clock-app/use-default-swipe-delete/+merge/191905 which utilises the emulator function and is a excellent example to reproduce this bug.