Display item from external script in network maps

Steps to reproduce:

1. Have a working network map with displayed external script item, external script has 3 parameters, 2 of them are makros and 1 is fixed number (port). Running on 4.0.9
2. Update to 4.2.4,
3. The before correct displayed item now shows UNKNOWN as value.

Detal:
item key: 

zext_ssl_expiry_sni.sh[\{HOST.IP},\{HOST.HOST},443]

label entry on network map:

{<hostname>:zext_ssl_expiry_sni.sh[\{HOST.IP},\{HOST.HOST},443].last(0)}

triggers with similar item key are still working, it's just an map issue.