Well, that is gusts you mean. That should be there because they added that in su10. They add gusts from Meteoblue & METAR data.
From release notes su10:
Added gusts to live weather: Added data pipeline between live weather (meteo blue & metar) and sim for gust data so that the sim features real world gusts in live weather (Forum Thread) 
Those should feel more in light aircraft.
17:00Z is an issue or maybe a change into more updated data that occure at that time and then they maybe use another data in the meantime it’s updated, thats what i mean by it can be intended to work like that?