I am trying to simulate the flow of signal arguments defined in a sequence diagram through the connectors of internal block diagrams as shown in the video below. ( up to minute 18)

(421) Sequence Diagram as Interaction Scenario - YouTube

However, the simulation terminates before the second argument ("speed") is flowed to the opaque behavior pin. I added the video of it.

Also, I expect the opaque behavior to execute first, followed by the transmission of the "trigger alert" message to the other part property (notifier).

Do you have any ideas on how to achieve this?