Advanced search 'does not contain' problem

I want to do a search with two criteria for items with attachments:

-Item is in a specific collection
-Item attachment 'does not contain' a specific word

I can get a comparable search to work fine for [Attachment Content] [contains] [any word].

But when I want to search attachments that [does not contain] a specific word (e.g. 'dog') I still get a full list of results, all of which have 'dog', as it were.

I've checked [Include parent and child items of matching items] and the search mode [Match all of the following].

Any help much appreciated!

Running Zotero for Mac, 6.0.30.
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