Process model' start form doesn't open when called from parent process model

Certified Senior Developer

Hi, I am trying to call a process from parent process model but the start form in child process does not open and flow just pass through it. I tried with activity chaining or used subprocess but nothing worked.

One way i know to change the process start form to task based form but wanted to check if there is any other way without it?

Parent PM:

Child PM:

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