My first 2019 problem: I'm studying the trigger behavior and I'm not able to understand why the variable tied to a fields change but the relative triggers don't do the same.
What you are seeing is as designed. The trigger is only fired for user initiated actions, not changes performed by Actions. Your field OnChange action sets a variable but this will not trigger the onChange for the variable. This is to prevent an endless cascade of triggers. Imagine if in your example, the field OnChange trigger changed a variable and the variable OnChange trigger changed the field. would They ping-pong back and forth forever.
So the next question is: what about if I have to link and action to the change of a variable or a field NOT as a consequence of a direct change made up by the user?
