I am not re-asking this question or this question, which concern the absolute number of times Jesus was anointed with perfume. I'm asking about a confusing fact from the Gospel of John, by itself, irrespective of the accounts in the Synoptics. In Chapter 11 Verse 2 of his Gospel, John refers to the anointing by Mary, sister of Lazarus, as a past event, but he doesn't describe the anointing itself until later, in Chapter 12 Verse 3. Is this simply an error in transmission of the Gospels over the millennia, or is John suggesting that Mary, the sister of Lazarus, performed this act twice?
I notice that none of the answers to either of the aforementioned questions refers to any scholarly work or interpretive school. I've looked around and couldn't find any references to other than lay-opinions. Are there any scholarly or "official" opinions on this?