ANSI SaveToStream not saving empty TWPRichText content

We have a letter editor that may work with RTF letters or plain text emails, depending upon what is selected from a dropdown. When saving changes to any of the letters, a check is done to ensure that any email with content also has a Subject.

We are using Editor.SaveToStream to save the editor content back to the appropriate letter/email whenever the combo box changed, or the Done button was clicked. In WPTools 4, this worked. In version 5.20.8, it has the following problem. If we delete the content of an email and its Subject, we receive a warning that no subject exists for an email with content.

procedure TsViewEditFormLetterDialog.GetLetterFromEditor;var  lActiveLetter: TStringStream;begin  lActiveLetter := GetActiveLetter();  if StringIsNotEmpty(lActiveLetter.DataString) or StringIsNotEmpty(Editor.Text) then  begin    if fEditorIsInEditMode  then      Editor.SaveToStream(lActiveLetter)    else      fTemplateStorage.RTFText.SaveToStream(lActiveLetter);  end;end;

We discovered that the blank email was still seen by the system to contain content because of the RTF codes that were still present after deleting all the words.

I modified the code as shown below to special case the emails to use Editor.SaveToStream(s, 'ANSI').

procedure TsViewEditFormLetterDialog.GetLetterFromEditor;
var
  lActiveLetter: TStringStream;
begin
  lActiveLetter := GetActiveLetter();


  if StringIsNotEmpty(lActiveLetter.DataString) or StringIsNotEmpty(Editor.Text) then
  begin
    case fActiveLetterLanguage of
      fllEnglish, fllSpanish, fllFrench, fllOther :
        if fEditorIsInEditMode  then
          Editor.SaveToStream(lActiveLetter)
        else
          fTemplateStorage.RTFText.SaveToStream(lActiveLetter);


      fllEnglishEmail, fllSpanishEmail, fllFrenchEmail, fllOtherEmail :
        if fEditorIsInEditMode  then
          Editor.SaveToStream(lActiveLetter, 'ANSI')
        else
          fTemplateStorage.RTFText.SaveToStream(lActiveLetter);
    end;
  end;
end;

When using this code, lActiveLetter did NOT get emptied by the SaveToStream(lActiveletter, 'ANSI') statement when the Editor had no content.

When SaveToStream is used with no parameters, the visible words DO get removed from lActiveletter when the Editor had no content.

Is this a bug in the ANSI version of SaveToStream? It appears so to me.