Problem with Delphi 10.3.3 (Rio)

It appears that this Version of Delphi has removed access to private Fields.
JvFormStorage produces an AccessViolation when trying to exctract Sections.

Code Snippet:

function TMemIniFileHelper.ValueExists(const Section, Ident: string): Boolean;
var
  I: Integer;
  Strings: TStrings;
  Sections: TStringList;
begin
  {$IFDEF RTL310_UP} // 10.1 Berlin removed the access to private fields
  Sections := TMemIniFileAccess(Self).FSections;
  {$ELSE}
  Sections := Self.FSections;
  {$ENDIF RTL310_UP}
  I := Sections.IndexOf(Section);
  if I >= 0 then
  begin
    Strings := TStringList(Sections.Objects[I]);
    I := Strings.IndexOfName(Ident);
    Result := I >= 0;
  end else
    Result := False;
end;