Calendar App: display checked items in filter

I want to set up a filter to show only the items that are checked (column type: checkbox - star). I would assume the logic is to select "is not blank" but this doesn't work — it still shows every row, even the ones with blank checkboxes. Is there a different option I could select and what should I put in the "compared value" field to limit the view to checked items? I tried "contains" — "yes" and I tried "does not contain" — "null". Those did not work.

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