Let's say you have a folder called "dummy" and you rename it typing F2 and call it ".dummy" (with a dot prefix). When you press enter, the name change does not seem to have been taken into account since the folder still appears as "dummy". In my case, it should have disappeared from the view since I was not making this type of folders visible.
In actuality, the change of name was made.
It's apparent after refreshing the view (pressing F5), the folder disappears and becomes visible again when pressing Ctrl H and the name is .dummy as expected..