Alternative scenario flowchart is a place where the alternative scenario should be located in case something goes wrong in the main scenario.
The alternative scenario can be only a very brief information on the activity in which the scenario stopped working properly - and such a scenario is already pre-built here.
But it can also be a quite complex scenario, allowing you to save the current state of the scenario in the event of a failure, transfer data to logs for analysis, send an email to the appropriate person with information or restart the entire scenario. The values of the variables used in the main scenario can be transferred to an alternative scenario (when appropriate variables are declared in it).