Greetings.
I noticed Blender 2.8 for Windows platform has at least three different scenarios to where blender could warn you to when a project has not been saved. On using them I have found these warnings messages inconsistent on display
Please see below link for details.
In my humble opinion, Scenario ones Dialogue box should be used for all three save changes alert scenarios on a windows platform, as a Newbie myself this is the easiest one to follow.