Recordset and Dictionary subtleties

Code:

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'Run in Microsoft Access 2007 VBA.
Sub CantUnderstand()
Dim rst As Recordset, dic As New Dictionary, c As Byte

Set rst = CurrentDb.OpenRecordset("SELECT [Artículo] FROM [Faltantes]", dbOpenForwardOnly)  'Recordset 'rst' has more than 5 records.

For c = 1 To 5
  dic.Add c, rst(0)    'Field '0' is string-type.
  rst.MoveNext
Next c
rst.Close

MsgBox dic.Item(1)  '"Error 3420. Object is not valid or has no value." I get this when reading items in Dictionary 'dic'.

End Sub

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Hope someone can explain me this odd behavior. Have done many tests. Strange things happen when you write directly from a recordset.field on the item argument of a dictionary.add method.