The Screen Element "plain text" is not showing the last element. It depents of the zoom value selected. If zoom is 1 hour, it shows the value from 1 hour ago. If zoom is 30 minutes, it shows the value from 30 minute ago. The only way to see the last value it to go to "Monitoring -> lastest data".

This happens since upgraded to Zabbix 4. With zabbix 3 was working fine.

**Steps to reproduce:

1. On "Monitoring -> Screens" create an Screen
2. Then create an screen element of "plain text" type
3. Select the item you want to show, and set "1" as the number of lines you want to see.

Result:
The screen element is showing the element of the item's history from 1 hour ago, or whatever vale for the zoom.
Expected:
To see the lastest data as on zabbix version 3.