Activity Chaining Behavior for User Input Task On And Gate

Hi,

I have a process model where a rule is processed in a script task running parallel to a user input task. At the second AND gate, there are two possible scenarios:

1. First API Call Path Reaches the AND Gate First: The API path reaches the AND gate before the user submits the task. This scenario works as expected, triggering the next chained User Input Task (UIT) in the process after the submission of first UIT.

2. User Submits the Task First: The user submits the task before the API path reaches the AND gate. In this case, the next UIT is not triggered as expected.

anyone knows what's the reason for this to happen ?

note : the script task is not an actual API call but just an expression rule with some dummy data
Thanks