Steps to reproduce:

1. Define the media type 
   The type : Script
   Set the script name
   Set a message with the macro {TRIGGER.TEMPLATE.NAME}
   Set a script parameter with the {TRIGGER.TEMPLATE.NAME}

1. Associate an action the HOST test

1. Generating an action from a trigger HOST

Result:

In the event details, you don't see the value of {TRIGGER.TEMPLATE.NAME}

In the log of action script, you don't see the value of {TRIGGER.TEMPLATE.NAME}.

Expected: