Event trigger broken in 0.56.1

[dale3h]

Home Assistant release (hass --version):
Problem is present in 0.56.1 and 0.57.0.dev0

Python release (python3 --version):
Python 3.5.2

Component/platform:
automation

Description of problem:

• In 0.55.1 this automation triggers as expected: https://github.com/dale3h/homeassistant-config/blob/master/packages/drop-in/zwave_minimote.yaml#L49
• In 0.56.1 the automation does not trigger, and the log only shows:

2017-10-22 14:15:19 INFO (MainThread) [homeassistant.core] Bus:Handling <Event zwave.scene_activated[L]: scene_id=1, entity_id=zwave.blue_iris_remote, node_id=12>

Expected:
Expected behavior is for the automation to trigger upon the event firing.

Problem-relevant configuration.yaml entries and steps to reproduce:

automation:
  - alias: minimote_button_pressed
    initial_state: 'on'
    trigger:
      - platform: event
        event_type: zwave.scene_activated
    action:
      ...

[emlove]

Likely caused by #9732 I'll take a look

[jamieshaw]

I'm seeing this too. Triggers monitoring state_changed are failing to execute; condition or otherwise.