Cause
A max_severity other than info requires the highlights.content path.
What to do
Add the highlights.content path or use info.
application/problem+json
{
"type": "https://masnet.com/developers/errors/severity_without_highlights",
"title": "Severity without highlights",
"status": 422,
"detail": "...",
"code": "severity_without_highlights",
"correlation_id": "..."
}