Please find an example template with a discovery rule attached.

Steps to reproduce:

1. Import the attached discovery template.
2. Create a host and attach the imported TMPL:APPL:Windows:Mona:Test template
3. Send a discovery for the host via zabbix sender for the key: ifx.mona.discovery.processes that contains the following data:

   {\"data\":[{\"{#NAME}\":\"Process.exe\",\"{#NAME_WITHOUT_EXTENSION}\":\"Process\"}, {\"{#NAME}\":\"process\",\"{#NAME_WITHOUT_EXTENSION}\":\"process\"} ]}
   

Full example call:

./zabbix_sender --zabbix-server <zbxserver> --host TEMPLATE_TEST_HOST --key ifx.mona.discovery.processes --value "{\"data\":[{\"{#NAME}\":\"Process.exe\",\"{#NAME_WITHOUT_EXTENSION}\":\"Process\"}, {\"{#NAME}\":\"process\",\"{#NAME_WITHOUT_EXTENSION}\":\"process\"} ]}" --verbose

Result:
The 3 perf_counter["\Process({#NAME_WITHOUT_EXTENSION}) items are missing due to an internal zabbix error
--> the #NAME_WITHOUT_EXTENSION leads to a duplicate key, but the error is not reflected in Zabbix

Expected:
The discovery rule should be marked with an error (as shown in the attached image: no_discovery_error_Process_process)

Note:
When the upper / lower case of the macro is the same the error works -> shown in the other example image: discovery_error_process_process

Easy to reprodue by changing the call to:

{\"data\":[{\"{#NAME}\":\"Process.exe\",\"{#NAME_WITHOUT_EXTENSION}\":\"process\"}, {\"{#NAME}\":\"process\",\"{#NAME_WITHOUT_EXTENSION}\":\"process\"} ]}