Fails without Error:
./zabbix_sender --zabbix-server <zabbix_server> --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

Fails with correct Error:
./zabbix_sender --zabbix-server <zabbix_server> --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

Works as expected:
./zabbix_sender --zabbix-server <zabbix_server> --host TEMPLATE_TEST_HOST --key ifx.mona.discovery.processes --value "{\"data\":[{\"{#NAME}\":\"Process.exe\",\"{#NAME_WITHOUT_EXTENSION}\":\"Process\"}, {\"{#NAME}\":\"process_2\",\"{#NAME_WITHOUT_EXTENSION}\":\"process_2\"} ]}" --verbose