The update happened to my FireHD 10 (7th Generation) on 04/april/2019 It was intended to fix some bugs. It has turned out to be a disaster when running Routines using calander events. It also upset direct alexa calanderI commands such as 'Alex whats on my calander next week. I had to phone up and got the direct commands fixed but still not dependable.
I have a thread running on that topic. If you use Routines.