Steps to reproduce:

1. Upgrade from 3.4
2. Remove existing outdated OSX template
3. Try importing OSX template from git.zabbix.com
4. Error stating "Host group "Templates/Operating Systems" already exists." returned
5. Remove checkbox to create new groups
6. Error stating "Group "Templates/Operating systems" does not exist." returned

Result:
See attached screen recording GIF
Expected:
Template to be imported and merged into group