Hi Antony , please check the Action tab of the flow action, you can find the assignment settings.
Ideally if when condition mentioned in the security Fails , system automatically tries to find the next assignment/local action to display . if there are no local action/assignments to process then Confirm harness is Displayed.
I am also experiencing this issue, I have added a Required condition to the flow action, which is correctly evaluating to false, this flow action is not launching. But a seemingly random flow action is launching instead.
It isn't an unfinished action, it is something not yet carried out on this case. And back-to-back processing is not enabled