Friendly Name notification clarification

Basic question from a new user. Setting up a Home Assistant Green, Migrating from Homeseer, and setting up notifications.

I have named a Z-wave Door/Window sensor device “Door - Front” via the UI.

Using either syntax:
{{ trigger.name }} or {{ trigger.to_state.attribitues.friendly_name }}
results in the same text being delivered as:
“Door - Front Window/door is open”

Message is set up as the following to test the results:

message: {{ trigger.name }} — {{ trigger.to_state.attributes.friendly_name }}

I would have expected to just see “Door - Front” without the additional text “Window/door is open”.

Am I missing somewhere where I define a Friendly Name? Where is the “Window/door is open” text coming from?