I created a new RL and was playing around with it. At one point I added a Means to Activate based on an illuminance sensor. Subsequent to that I removed that MtA (unchecked the device selector and the capability selector). It no longer shows up as a MtA, as expected. However, the RL is still subscribing to the illuminance sensor and the Log shows triggers on that device. This is unexpected.
Screenshots below show the RL, the Event subscriptions, and the Logs.