When I try to do that I get this error:

Undefined index: snmpv3_authprotocol [conf.import.php:130 ? CConfigurationImport->import() ? CConfigurationImport->processItems() ? CAPIObject->create() ? CAPIObject->__call() ? czbxrpc::call() ? czbxrpc::callAPI() ? call_user_func() ? CItem->create() ? CItem->checkInput() ? CItemGeneral->checkInput() in /usr/local/www/zabbix/api/classes/CItemGeneral.php:333]
Incorrect authentication protocol for item "test snmpv3".

It happened after implementing ZBXNEXT-450

According to our vision it has to be supported.