It seems that the Zabbix frontend is not able to import a map containing hosts created from Host prototypes in a Low-Level Discovery rule.
Scenario to reproduce this issue :
- define a map with two icons : one displaying a host created manually and the other displaying a host created from a host prototype.
- export the map
- delete this map in the frontend / or edit the exported XML file to change the map name in order to import it with another name (<maps><map><name>...</name></map></maps>)
- import the map
The Zabbix frontend will display an error label "Cannot find host "LLD discoverd host name" used in map "Your Map name".
Removing this host inside the XML export file (delete <selement> containing this host) allows the import of the map.