this issue is ages old.  I bring it up because it needs fixing.

this screenshot shows 2 user waypoints.

The first one (USER WPT) is missing one number of the coordinates, that seems to be hidden under the icon.

The second one (AaBb&89) is a font test.  It can only be named in this way through the menu „my user waypoints“.  Trying the editing function of the aerodata window will fail, as this only produces capital letters and ignores special characters.