zabbix_server 4.0.12 | Screen | Plain Text | Show only last value

[LovingFox]

I want to use a "Plain Text" Resource at the Screen page. And I want the Screen show me only last value of the Item, so I set "Show lines" as 1. But the Screen show me not last value but first (oldest value).
What is the problem? Is it a bug?

Server version:

user@server:~$ zabbix_server -V
zabbix_server (Zabbix) 4.0.12
Revision fb4010108b 26 August 2019, compilation time: Aug 26 2019 14:54:47

Copyright (C) 2019 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.

This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).

Compiled with OpenSSL 1.0.2g-fips  1 Mar 2016
Running with OpenSSL 1.0.2g  1 Mar 2016