Last function for discard unchanged value in map (macro)

[erasedhammer]

Zabbix 6.4

My Item (user parameter to get IP):
WAN Interface IP Address
system.ip.wan
Text
10m
Preprocessing: Discard Unchanged

Macro on map:
{?last(/fw/system.ip.wan)}

The wan IP item does have stored data in the lastest data tab.
I can change the macro to {?last(/fw/system.uptime)} and it shows the uptime.

How can I display the current value of a item (that is setup to discard unchanged) in a macro on the network map?
Currently it just says "UNKNOWN"

Is there some special way to get the macro in the map to display an old unchanged value? Or is it impossible, and I have to delete the processing step on the item?

[Eduardobbastos]

Uptime:{?last(/{HOST.HOST}/system.uptime)}
Assim desse modo vai funcionar!

[markfree]

I think your best option is to change the preprocessing step to "discard unchanged with a heartbeat".
Set it to 1d and your map should display your firewall IP correctly.