NotesDocument.save() causing loss of rich text formatting - lotus-domino

Question

I have following code in an lotusscript agent that removes attachments from NotesDocuments. But NotesDocument.save() causes loss of rich text formatting (font, color). Is there any way to retain the formatting?
Sub removeAttachments_v2(doc As NotesDocument)
Dim session As NotesSession
Dim rtitem As Variant
Dim filename As String
Dim ans As Variant
Set session = New NotesSession
Dim richstyle As NotesRichTextStyle
Set richstyle = session.CreateRichTextStyle
richstyle.NotesColor = COLOR_BLUE
If doc.HasEmbedded Then
Set rtitem = doc.getfirstitem("Body")
If (rtitem.type = RICHTEXT) Then
ForAll object In rtitem.EmbeddedObjects
If (object.Type = EMBED_ATTACHMENT) Then
filename = object.source
Call object.remove
Call rtitem.AddNewLine( 2 )
Call rtitem.AppendStyle(richstyle)
Call rtitem.AppendText( "Attachemnt removed: " & filename )
Call doc.Save( True, True , True )
End If
End ForAll
End If
End If
End sub
Edit1: Initialize function
Sub Initialize
Dim db As New NotesDatabase("","")
Dim col As NotesDocumentCollection
Dim doc As NotesDocument
Call db.Open("", "C:\this\is\db\dir\test.nsf")
Set col = db.Alldocuments
Set doc = col.Getfirstdocument()
While Not ( doc Is Nothing )
Call RemoveAttachments_v2(doc)
Call doc.Save(False, False, False)
Set doc = col.GetNextDocument( doc )
Wend
End Sub

Answer 1

Despite of the fact, that you save the document for every attachment I cannot find any reason, why this should happen. I just copied your code in an agent, and it removes the attachments as desired and appends the text in blue...
No formatting is lost...
The error has to be somewhere else in your code, probably in the calling function.
OLD ANSWER (wrong due to own tests, just kept here as history):
The Problem here most probably is: you defined rtitem as Variant. And
getfirstitem gets you a NotesItem instead of a NotesRichtextItem, so
when saving, it is converted to a "plain Text" item.
Most probably you used Variant instead of NotesRichtextItem, because
there are Mime- mails where defining the variable as NotesRichtextItem
will cause an "Type Missmatch" or similar error. As long as you do not
write anything back this is OK.
As Mime Mails need complete different handling to achieve your goal,
you should first fix the code for pure NotesRichtextItems by using the
right type, and then write another code- branch for handling Mime-
items