Unable to save modified dashboard under same name

Am editing dashboard. When I hit left arrow icon (top left corner of the screen) I am prompted for new name to save my changes instead of changes being saved under current dashboard. So - after changing something in dashboard and than saving it, there are two dashboards. In the past there was no new dashboard created on every save,

Some type of workaround is not to type new name and hit Save button. All changes get saved under current name than (= no new dashboard is created). But its not known (and I suppose not desired) behaviour.
This should be clearly stated (even in the save dialog) as its misleading