OIC 3 – Values appear correctly in Logger but become NULL after mapping / NXSD translation

I am facing an issue in OIC 3 where values are present in the payload and visible in Logger actions, but after mapping (during NXSD translation / response generation), the same values become NULL in the final output.

This behavior is confusing because the data is clearly not null in the logs, yet the mapped response contains nulls.

1. I build an XML payload programmatically using assignments and stitch actions.
2. I log the payload using Logger action.
3. The Logger shows the correct values.
4. After mapping the same payload to the response (NXSD-based), some elements appear as empty / null.

Logged Payload (Correct)

The Logger shows the following XML (values exist):