Error Data Paylod Not Following Spec in Faces 4.0

The Error Data Payload (Table 16)] outlined in the spec isn't followed. As seen in the screenshot below something seems to be going wrong for responseText, responseCode, and status. Additionally, description and responseXML aren't included in the payload.

The response from the server still seems to be accurate:

<?xml version="1.0" encoding="UTF-8"?><partial-response><error><error-name>org.apache.myfaces.view.facelets.el.ContextAwarePropertyNotFoundException</error-name><error-message><![CDATA[jakarta.el.PropertyNotFoundException: Target Unreachable, identifier [testCode] resolved to null]]></error-message></error></partial-response>

The information seems to be lost somewhere in between the server response and error payload generation.