After restarting Zabbix server all triggers that have nodata(24h)=0 start alerting and only way is to close the problems until zabbix-server is restarted again.  It is kind of related to https://support.zabbix.com/browse/ZBX-17422 since the error in the trigger page is the same: 
Cannot evaluate expression: "Cannot evaluate function "eeemfs5.internal.ekspressgrupp.eu:eventlog[System, C: \(,,Microsoft-Windows-Ntfs,^98$,,skip].nodata(24h)": item does not have enough data after server start or item creation.".

I understand, that this problem should go OK after 24h, but the problem started after ugprading from Zabbix 4.4.6 -> 5.0.1. In 4.4.6 there were no such problems after restarting Zabbix server so is this a new feature or a bug?