Steps to reproduce:
- Create an item prototype that uses JSON path preprocessing to extract a field. This field can either be a JSON string or JSON null.
- Add a trigger prototype with the following expression:
- Monitor the template via a Zabbix Proxy
- Since Zabbix Proxy 6.0.12 a JSON null is converted to the JSON string "null" causing the trigger to fire.
- JSON null should not be converted to the string "null"