Multi_match fuzzy matching on shingled field

I am trying to get some fuzzy matching setup on a multi_match query of a field that has been shingled.

Here is my mappings and queries.

Both fuzzy queries match all documents, which is what I would expect.

However on the multi_match - when searching for text books, I only get the document with title text books back, not the other.

I was wondering if any light might be shed onto why, or how I might go about debugging this?

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