1st: never use a tag or variable as Transition name. Just enter a name in the ‘Pick’ field, en then select the name popped up in the black dropdown.
Next, save the flow.
This way you:
Create the new transition
You are certain you don’t use an existing transition by accident.
2nd: you’ll need to update f.i. a dim value of a light, using the card WHEN “Transition Y reached a step”.
You"d select the transition’s name from the ‘Pick’ field dropdown.
As dimvalue tag of that light, select the local tag [Transitionvalue]
Flow example:
