User Input Task does not save Rule Input value back to Process Variable

Hi I’m new for Appian,  I have a simple test case:

Process Variable:
pv!test (Text)
Default Value = "ABC"

Interface Rule Input:
ri!test (Text)

Interface:

- The form displays ri!test.
- User changes the value from "ABC" to "HELLO".
- A debug field confirms that ri!test contains "HELLO".

User Input Task Forms mapping:

ri!test = pv!test

Continue button:

submit: true

Issue:

After clicking Continue and completing the User Input Task, the process variable pv!test still contains the original value "ABC".

The Rule Input (ri!test) is updated correctly inside the form, but the Process Variable (pv!test) is not updated.

My expectation was that the updated Rule Input value would automatically be written back to the mapped Process Variable when the task is submitted.

Am I missing an additional configuration step?

Do I need to configure something in the Data > Outputs tab, or should the Forms mapping handle this automatically?

Any advice would be appreciated.

Thanks!