Steps to reproduce:

1. Create a dashboard
2. Set permissions to public for a dashboard
3. Try to clone and save the cloned dashboard with a user who has read only permissions
4. An error is shown:
   

Expected:
The behavior as described in the documentation:

• They can see and clone a dashboard if they have at least READ rights to it;

https://www.zabbix.com/documentation/current/en/manual/web_interface/frontend_sections/dashboards#permissions-to-dashboards