Custom filter doesn't work

I’m trying to make fitness app.
There are 3 main collections: Users, Classes and Applies.


On the main screen there’s a list of classes.
I want to show classes that user hasn’t applied yet.
To do that I use Custom Filter.

And… it’s not working. I still see all classes.
I checked the collections and there’re all records I need.
I tried to use same logic on another screen for button custom visibility.
And it worked properly!

I really can’t figure out what’s wrong =(

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