User macros not substituted by value in Zabbix trapper item key

[DRVTiny]

I am Zabbix administrator since 2.0 version (2013), so i dont think this isa simple problem to solve, but...
In Zabbix 4.2.1 installation
I have an item of type "Zabbix trapper".
It's key is: << ipa_replication_status[{$IPA_SERVER_RIGHT},{$IPA_SERVER_LEFT}] >>
Macroses mentioned in item key is defined on the host level (and NOT defined in template containing item "ipa_replication_status")
Host is monitored by zabbix_proxy, which version is 4.2.1 too.
If i send value to this item - i've got "failed: 1"
OK, now i've replaced macroses by its values in item_key
And, WOW, i've got it! zabbix_sender did its work successfully.
I've used user macros very wide over all of my zabbix installations. I've never have problems with user macroses in item keys.
I can see this macroses in hosts_macroses table in zabbix_proxy database - and its properly attached to the host.
So... i don't know what to think. Maybe, it is a bug in Zabbix 4.2 code?
How can i debug this problem?

[Hamardaban]

Hi ! https://www.zabbix.com/documentation...mtypes/trapper "Zabbix trapper process does not expand macros used in the item key in attempt to check corresponding item key existence for targeted host."

[Semiadmin]

I'd say "Zabbix trapper process does not expand USER macros used in the item key". There aren't such problems with LLD macros.