RSRP-204302: Macro "Value of another variable with the first character in upper case" in Live Template not usable for fields with underscore

I have the following template:

private $type$ $fieldname$;
public $type$ $propertyname$
{
    get { return $fieldname$; }
    set
    {
        if(value != $fieldname$)
        {
            $fieldname$ = value;
            InvokePropertyChanged(new PropertyChangedEventArgs("$propertyname$"));
        }
    }
}

with the following settings:
type: Choose macro
fieldname: suggest name for a variable
propertyname (Not editable): Value of fieldname with the first character in upper case
the suggested name for fieldname is correctly "_type".
The macro "Value of another variable with the first character in upper case" should use the first alphanumeric character of the variable...
Right now, I can't use the template like this