QM Evaluation Webhook to ServiceNow Failing with 422 Unprocessable Entity

Stuck on mapping QM evaluation results from Genesys Cloud to ServiceNow incidents via Data Actions. The webhook returns a 422 Unprocessable Entity error specifically when the ‘overall_score’ field contains a null value, despite the ServiceNow REST API documentation stating it accepts nullable integers.

The payload structure matches the Genesys Cloud schema exactly, and manual POST requests to ServiceNow with null scores succeed. Suspect a type coercion issue within the Data Action transformation step. Can anyone confirm the expected JSON structure for nullable numeric fields in this integration?