XML after export cannot be imported back in

continued problems https://support.zabbix.com/browse/ZBX-11352
XML after export cannot be imported back in and get error
Import failed
Details

Incorrect bulk value for interface. [conf.import.php:173 ? CFrontendApiWrapper->import() ? CApiWrapper->__call() ? CFrontendApiWrapper->callMethod() ? CApiWrapper->callMethod() ? CFrontendApiWrapper->callClientMethod() ? CLocalApiClient->callMethod() ? call_user_func_array() ? CConfiguration->import() ? CConfigurationImport->import() ? CConfigurationImport->processHosts() ? CHostImporter->import() ? CHost->update() ? CHost->massUpdate() ? CHostInterface->replaceHostInterfaces() ? CHostInterface->checkInput() ? CHostInterface->checkBulk() ? CApiService::exception() in include/classes/api/services/CHostInterface.php:658]