Steps to reproduce:

1. Create item with JSON document data (e.g. wmi.getall["root\virtualization\v2","SELECT ElementName,Name,ProcessID,HealthState,NumberOfNumaNodes,OnTimeInMilliseconds,OperationalStatus,ReplicationHealth,ReplicationMode,ReplicationState FROM msvm_computersystem WHERE Caption = 'Virtual Machine'"]
2. Create dependent item with preprocessing step with JSONPath contains .first().first() methods (e.g. $.[?(@.ElementName == "VMNAME")].OperationalStatus.first().first()

Result:
Because of OperationalStatus is a list we need to use double .first() to retrieve value. But Zabbix Server crashes while extracting it. Trace log attached.