Filter List is not working when list is empty

Hi Guys, I have a list of matches in my User collection and I want to call all this matches in a query collection using a filter: So, 1. I made a query collection, 2. I add a Filter "uid" in my matches list, but when the list is empty this return all the user documents. I have a simple solution: Add a element in matches list when user creates his account, but I have the doubt why this filter doesn't work when list is empty. Thanks!

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